72957172 has 6 divisors (see below), whose sum is σ = 127675058. Its totient is φ = 36478584.

The previous prime is 72957107. The next prime is 72957191. The reversal of 72957172 is 27175927.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 40398736 + 32558436 = 6356^2 + 5706^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9119643 + ... + 9119650.

Almost surely, 2^72957172 is an apocalyptic number.

It is an amenable number.

72957172 is a deficient number, since it is larger than the sum of its proper divisors (54717886).

72957172 is a wasteful number, since it uses less digits than its factorization.

72957172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18239297 (or 18239295 counting only the distinct ones).

The product of its digits is 61740, while the sum is 40.

The square root of 72957172 is about 8541.4970584787. The cubic root of 72957172 is about 417.8521718050.

The spelling of 72957172 in words is "seventy-two million, nine hundred fifty-seven thousand, one hundred seventy-two".