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66297980 = 2257267651
BaseRepresentation
bin1111110011101…
…0000001111100
311121202021201202
43330322001330
5113433013410
610324555032
71433344400
oct374720174
9147667652
1066297980
1134472721
121a252a78
1310973798
148b3b100
155c48ca5
hex3f3a07c

66297980 has 36 divisors (see below), whose sum is σ = 161958888. Its totient is φ = 22730400.

The previous prime is 66297971. The next prime is 66298003. The reversal of 66297980 is 8979266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32846 + ... + 34805.

It is an arithmetic number, because the mean of its divisors is an integer number (4498858).

Almost surely, 266297980 is an apocalyptic number.

It is an amenable number.

66297980 is an abundant number, since it is smaller than the sum of its proper divisors (95660908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66297980 is a wasteful number, since it uses less digits than its factorization.

66297980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67674 (or 67665 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 66297980 is about 8142.3571525695. The cubic root of 66297980 is about 404.7312752744.

The spelling of 66297980 in words is "sixty-six million, two hundred ninety-seven thousand, nine hundred eighty".

Divisors: 1 2 4 5 7 10 14 20 28 35 49 70 98 140 196 245 490 980 67651 135302 270604 338255 473557 676510 947114 1353020 1894228 2367785 3314899 4735570 6629798 9471140 13259596 16574495 33148990 66297980