72729232 has 10 divisors (see below), whose sum is σ = 140912918. Its totient is φ = 36364608.

The previous prime is 72729143. The next prime is 72729233. The reversal of 72729232 is 23292727.

It can be written as a sum of positive squares in only one way, i.e., 71639296 + 1089936 = 8464^2 + 1044^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (72729233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2272773 + ... + 2272804.

Almost surely, 2^72729232 is an apocalyptic number.

It is an amenable number.

72729232 is a deficient number, since it is larger than the sum of its proper divisors (68183686).

72729232 is a wasteful number, since it uses less digits than its factorization.

72729232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545585 (or 4545579 counting only the distinct ones).

The product of its digits is 21168, while the sum is 34.

The square root of 72729232 is about 8528.1435259967. The cubic root of 72729232 is about 417.4165528180.

The spelling of 72729232 in words is "seventy-two million, seven hundred twenty-nine thousand, two hundred thirty-two".