72757890820 has 24 divisors (see below), whose sum is σ = 154143713304. Its totient is φ = 28845605376.

The previous prime is 72757890817. The next prime is 72757890833. The reversal of 72757890820 is 2809875727.

It can be written as a sum of positive squares in 4 ways, for example, as 608707584 + 72149183236 = 24672^2 + 268606^2 .

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, 16094619 + ... + 16099138.

It is an arithmetic number, because the mean of its divisors is an integer number (6422654721).

Almost surely, 2^72757890820 is an apocalyptic number.

It is an amenable number.

72757890820 is an abundant number, since it is smaller than the sum of its proper divisors (81385822484).

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

72757890820 is a wasteful number, since it uses less digits than its factorization.

72757890820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32193879 (or 32193877 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 55.

The spelling of 72757890820 in words is "seventy-two billion, seven hundred fifty-seven million, eight hundred ninety thousand, eight hundred twenty".