78774756728 has 32 divisors (see below), whose sum is σ = 148271731200. Its totient is φ = 39235886208.

The previous prime is 78774756677. The next prime is 78774756763. The reversal of 78774756728 is 82765747787.

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, 2524550 + ... + 2555562.

It is an arithmetic number, because the mean of its divisors is an integer number (4633491600).

Almost surely, 2^78774756728 is an apocalyptic number.

It is an amenable number.

78774756728 is a deficient number, since it is larger than the sum of its proper divisors (69496974472).

78774756728 is a wasteful number, since it uses less digits than its factorization.

78774756728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32231 (or 32227 counting only the distinct ones).

The product of its digits is 258155520, while the sum is 68.

The spelling of 78774756728 in words is "seventy-eight billion, seven hundred seventy-four million, seven hundred fifty-six thousand, seven hundred twenty-eight".