78774870664 has 32 divisors (see below), whose sum is σ = 168851390400. Its totient is φ = 33751039680.

The previous prime is 78774870659. The next prime is 78774870673. The reversal of 78774870664 is 46607847787.

It is a junction number, because it is equal to n+sod(n) for n = 78774870596 and 78774870605.

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, 334 + ... + 396925.

It is an arithmetic number, because the mean of its divisors is an integer number (5276605950).

Almost surely, 2^78774870664 is an apocalyptic number.

It is an amenable number.

78774870664 is an abundant number, since it is smaller than the sum of its proper divisors (90076519736).

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

78774870664 is a wasteful number, since it uses less digits than its factorization.

78774870664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400813 (or 400809 counting only the distinct ones).

The product of its (nonzero) digits is 88510464, while the sum is 64.

The spelling of 78774870664 in words is "seventy-eight billion, seven hundred seventy-four million, eight hundred seventy thousand, six hundred sixty-four".