78365660 has 12 divisors (see below), whose sum is σ = 164567928. Its totient is φ = 31346256.

The previous prime is 78365653. The next prime is 78365681. The reversal of 78365660 is 6656387.

It is a super-2 number, since 2×78365660² = 12282353334471200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1959122 + ... + 1959161.

It is an arithmetic number, because the mean of its divisors is an integer number (13713994).

Almost surely, 2^78365660 is an apocalyptic number.

It is an amenable number.

78365660 is an abundant number, since it is smaller than the sum of its proper divisors (86202268).

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

78365660 is a wasteful number, since it uses less digits than its factorization.

78365660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3918292 (or 3918290 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 78365660 is about 8852.4380822460. The cubic root of 78365660 is about 427.9324943756.

The spelling of 78365660 in words is "seventy-eight million, three hundred sixty-five thousand, six hundred sixty".