78665560 has 32 divisors (see below), whose sum is σ = 177305040. Its totient is φ = 31411584.

The previous prime is 78665557. The next prime is 78665611. The reversal of 78665560 is 6556687.

It is a super-2 number, since 2×78665560² = 12376540660227200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27979 + ... + 30661.

Almost surely, 2^78665560 is an apocalyptic number.

It is an amenable number.

78665560 is an abundant number, since it is smaller than the sum of its proper divisors (98639480).

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

78665560 is a wasteful number, since it uses less digits than its factorization.

78665560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3427 (or 3423 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 78665560 is about 8869.3607435936. The cubic root of 78665560 is about 428.4776889162.

The spelling of 78665560 in words is "seventy-eight million, six hundred sixty-five thousand, five hundred sixty".