78665516 has 24 divisors (see below), whose sum is σ = 142884000. Its totient is φ = 37850624.

The previous prime is 78665471. The next prime is 78665549. The reversal of 78665516 is 61556687.

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, 40700 + ... + 42588.

It is an arithmetic number, because the mean of its divisors is an integer number (5953500).

Almost surely, 2^78665516 is an apocalyptic number.

It is an amenable number.

78665516 is a deficient number, since it is larger than the sum of its proper divisors (64218484).

78665516 is a wasteful number, since it uses less digits than its factorization.

78665516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2281 (or 2279 counting only the distinct ones).

The product of its digits is 302400, while the sum is 44.

The square root of 78665516 is about 8869.3582631440. The cubic root of 78665516 is about 428.4776090294.

The spelling of 78665516 in words is "seventy-eight million, six hundred sixty-five thousand, five hundred sixteen".