78691551264 has 72 divisors (see below), whose sum is σ = 224011307520. Its totient is φ = 26203298688.

The previous prime is 78691551259. The next prime is 78691551293. The reversal of 78691551264 is 46215519687.

It is a happy number.

78691551264 is a `hidden beast` number, since 7 + 8 + 69 + 1 + 5 + 512 + 64 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 78691551264.

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, 137217 + ... + 419775.

It is an arithmetic number, because the mean of its divisors is an integer number (3111268160).

Almost surely, 2^78691551264 is an apocalyptic number.

It is an amenable number.

78691551264 is an abundant number, since it is smaller than the sum of its proper divisors (145319756256).

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

78691551264 is a wasteful number, since it uses less digits than its factorization.

78691551264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283542 (or 283531 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The spelling of 78691551264 in words is "seventy-eight billion, six hundred ninety-one million, five hundred fifty-one thousand, two hundred sixty-four".