79677973520 has 20 divisors (see below), whose sum is σ = 185251288620. Its totient is φ = 31871189376.

The previous prime is 79677973519. The next prime is 79677973589. The reversal of 79677973520 is 2537977697.

It can be written as a sum of positive squares in 2 ways, for example, as 13631029504 + 66046944016 = 116752^2 + 256996^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 497987255 + ... + 497987414.

It is an arithmetic number, because the mean of its divisors is an integer number (9262564431).

Almost surely, 2^79677973520 is an apocalyptic number.

It is an amenable number.

79677973520 is an abundant number, since it is smaller than the sum of its proper divisors (105573315100).

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

79677973520 is a wasteful number, since it uses less digits than its factorization.

79677973520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995974682 (or 995974676 counting only the distinct ones).

The product of its (nonzero) digits is 35006580, while the sum is 62.

The spelling of 79677973520 in words is "seventy-nine billion, six hundred seventy-seven million, nine hundred seventy-three thousand, five hundred twenty".