72731312 has 20 divisors (see below), whose sum is σ = 142315296. Its totient is φ = 36004800.

The previous prime is 72731311. The next prime is 72731327. The reversal of 72731312 is 21313727.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (72731311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20888 + ... + 24119.

Almost surely, 2^72731312 is an apocalyptic number.

It is an amenable number.

72731312 is a deficient number, since it is larger than the sum of its proper divisors (69583984).

72731312 is a wasteful number, since it uses less digits than its factorization.

72731312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45116 (or 45110 counting only the distinct ones).

The product of its digits is 1764, while the sum is 26.

The square root of 72731312 is about 8528.2654742919. The cubic root of 72731312 is about 417.4205320440.

The spelling of 72731312 in words is "seventy-two million, seven hundred thirty-one thousand, three hundred twelve".