Ответ:
1. 86904 = 2³ × 3 × 3618 (3618 = 2 × 1809; 1809 = 3 × 603; 603 = 3 × 201; 201 = 3 × 67)
2. 405117 = 3 × 135039 (135039 = 3 × 45013)
3. 319805 = 5 × 63961 (63961 = 7 × 9137)
4. 210591 = 3 × 70197 (70197 = 3 × 23399; 23399 = 7 × 3343)
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