72531772 has 12 divisors (see below), whose sum is σ = 129325896. Its totient is φ = 35581520.

The previous prime is 72531757. The next prime is 72531779. The reversal of 72531772 is 27713527.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72531779) 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, 170854 + ... + 171277.

It is an arithmetic number, because the mean of its divisors is an integer number (10777158).

Almost surely, 2^72531772 is an apocalyptic number.

It is an amenable number.

72531772 is a deficient number, since it is larger than the sum of its proper divisors (56794124).

72531772 is a wasteful number, since it uses less digits than its factorization.

72531772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342188 (or 342186 counting only the distinct ones).

The product of its digits is 20580, while the sum is 34.

The square root of 72531772 is about 8516.5586946841. The cubic root of 72531772 is about 417.0384481875.

It can be divided in two parts, 7253 and 1772, that added together give a square (9025 = 95²).

The spelling of 72531772 in words is "seventy-two million, five hundred thirty-one thousand, seven hundred seventy-two".