78665760 has 72 divisors (see below), whose sum is σ = 268451820. Its totient is φ = 20977152.

The previous prime is 78665753. The next prime is 78665771. The reversal of 78665760 is 6756687.

78665760 is a `hidden beast` number, since 78 + 6 + 6 + 576 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 78641424 + 24336 = 8868^2 + 156^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 25875 + ... + 28754.

Almost surely, 2^78665760 is an apocalyptic number.

It is an amenable number.

78665760 is an abundant number, since it is smaller than the sum of its proper divisors (189786060).

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

78665760 is a wasteful number, since it uses less digits than its factorization.

78665760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54650 (or 54639 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 78665760 is about 8869.3720183562. The cubic root of 78665760 is about 428.4780520377.

The spelling of 78665760 in words is "seventy-eight million, six hundred sixty-five thousand, seven hundred sixty".