72731320 has 32 divisors (see below), whose sum is σ = 165103920. Its totient is φ = 28833280.

The previous prime is 72731311. The next prime is 72731327. The reversal of 72731320 is 2313727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72731327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3526 + ... + 12565.

Almost surely, 2^72731320 is an apocalyptic number.

It is an amenable number.

72731320 is an abundant number, since it is smaller than the sum of its proper divisors (92372600).

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

72731320 is a wasteful number, since it uses less digits than its factorization.

72731320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16215 (or 16211 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 72731320 is about 8528.2659433205. The cubic root of 72731320 is about 417.4205473485.

The spelling of 72731320 in words is "seventy-two million, seven hundred thirty-one thousand, three hundred twenty".