72387863640 has 96 divisors (see below), whose sum is σ = 247642714800. Its totient is φ = 18287458560.

The previous prime is 72387863593. The next prime is 72387863651. The reversal of 72387863640 is 4636878327.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5284671 + ... + 5298350.

Almost surely, 2^72387863640 is an apocalyptic number.

It is an amenable number.

72387863640 is an abundant number, since it is smaller than the sum of its proper divisors (175254851160).

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

72387863640 is a wasteful number, since it uses less digits than its factorization.

72387863640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10583057 (or 10583050 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 54.

The spelling of 72387863640 in words is "seventy-two billion, three hundred eighty-seven million, eight hundred sixty-three thousand, six hundred forty".