72740631820 has 24 divisors (see below), whose sum is σ = 152804433600. Its totient is φ = 29086899072.

The previous prime is 72740631809. The next prime is 72740631857. The reversal of 72740631820 is 2813604727.

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, 520665 + ... + 645424.

It is an arithmetic number, because the mean of its divisors is an integer number (6366851400).

Almost surely, 2^72740631820 is an apocalyptic number.

It is an amenable number.

72740631820 is an abundant number, since it is smaller than the sum of its proper divisors (80063801780).

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

72740631820 is a wasteful number, since it uses less digits than its factorization.

72740631820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169217 (or 1169215 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 72740631820 in words is "seventy-two billion, seven hundred forty million, six hundred thirty-one thousand, eight hundred twenty".