78664847504 has 20 divisors (see below), whose sum is σ = 154911720060. Its totient is φ = 38687629440.

The previous prime is 78664847461. The next prime is 78664847531. The reversal of 78664847504 is 40574846687.

It can be written as a sum of positive squares in 2 ways, for example, as 30639001600 + 48025845904 = 175040^2 + 219148^2 .

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

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, 40298639 + ... + 40300590.

It is an arithmetic number, because the mean of its divisors is an integer number (7745586003).

Almost surely, 2^78664847504 is an apocalyptic number.

It is an amenable number.

78664847504 is a deficient number, since it is larger than the sum of its proper divisors (76246872556).

78664847504 is a wasteful number, since it uses less digits than its factorization.

78664847504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80599298 (or 80599292 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 59.

The spelling of 78664847504 in words is "seventy-eight billion, six hundred sixty-four million, eight hundred forty-seven thousand, five hundred four".