72172524 has 24 divisors (see below), whose sum is σ = 169254400. Its totient is φ = 23935824.

The previous prime is 72172523. The next prime is 72172547. The reversal of 72172524 is 42527127.

It is a junction number, because it is equal to n+sod(n) for n = 72172491 and 72172500.

It is not an unprimeable number, because it can be changed into a prime (72172523) 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, 12724 + ... + 17499.

Almost surely, 2^72172524 is an apocalyptic number.

It is an amenable number.

72172524 is an abundant number, since it is smaller than the sum of its proper divisors (97081876).

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

72172524 is a wasteful number, since it uses less digits than its factorization.

72172524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30429 (or 30427 counting only the distinct ones).

The product of its digits is 7840, while the sum is 30.

The square root of 72172524 is about 8495.4413658150. The cubic root of 72172524 is about 416.3487813969.

The spelling of 72172524 in words is "seventy-two million, one hundred seventy-two thousand, five hundred twenty-four".