72531324 has 18 divisors (see below), whose sum is σ = 183343160. Its totient is φ = 24177096.

The previous prime is 72531323. The next prime is 72531343. The reversal of 72531324 is 42313527.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×72531324² = 10521585922385952, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72531323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1007344 + ... + 1007415.

Almost surely, 2^72531324 is an apocalyptic number.

It is an amenable number.

72531324 is an abundant number, since it is smaller than the sum of its proper divisors (110811836).

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

72531324 is a wasteful number, since it uses less digits than its factorization.

72531324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2014769 (or 2014764 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 72531324 is about 8516.5323929402. The cubic root of 72531324 is about 417.0375895587.

The spelling of 72531324 in words is "seventy-two million, five hundred thirty-one thousand, three hundred twenty-four".