72931472 has 10 divisors (see below), whose sum is σ = 141304758. Its totient is φ = 36465728.

The previous prime is 72931471. The next prime is 72931501. The reversal of 72931472 is 27413927.

It can be written as a sum of positive squares in only one way, i.e., 58308496 + 14622976 = 7636^2 + 3824^2 .

It is not an unprimeable number, because it can be changed into a prime (72931471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2279093 + ... + 2279124.

Almost surely, 2^72931472 is an apocalyptic number.

It is an amenable number.

72931472 is a deficient number, since it is larger than the sum of its proper divisors (68373286).

72931472 is a wasteful number, since it uses less digits than its factorization.

72931472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4558225 (or 4558219 counting only the distinct ones).

The product of its digits is 21168, while the sum is 35.

The square root of 72931472 is about 8539.9925058515. The cubic root of 72931472 is about 417.8031016372.

The spelling of 72931472 in words is "seventy-two million, nine hundred thirty-one thousand, four hundred seventy-two".