72640541572 has 12 divisors (see below), whose sum is σ = 127593518220. Its totient is φ = 36185250656.

The previous prime is 72640541557. The next prime is 72640541647. The reversal of 72640541572 is 27514504627.

It can be written as a sum of positive squares in 2 ways, for example, as 40018402116 + 32622139456 = 200046^2 + 180616^2 .

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, 33753823 + ... + 33755974.

It is an arithmetic number, because the mean of its divisors is an integer number (10632793185).

Almost surely, 2^72640541572 is an apocalyptic number.

It is an amenable number.

72640541572 is a deficient number, since it is larger than the sum of its proper divisors (54952976648).

72640541572 is a wasteful number, since it uses less digits than its factorization.

72640541572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67510070 (or 67510068 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 43.

The spelling of 72640541572 in words is "seventy-two billion, six hundred forty million, five hundred forty-one thousand, five hundred seventy-two".