72157292 has 12 divisors (see below), whose sum is σ = 126420840. Its totient is φ = 36037056.

The previous prime is 72157291. The next prime is 72157297. The reversal of 72157292 is 29275127.

It is not an unprimeable number, because it can be changed into a prime (72157291) 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, 6317 + ... + 13572.

It is an arithmetic number, because the mean of its divisors is an integer number (10535070).

Almost surely, 2^72157292 is an apocalyptic number.

It is an amenable number.

72157292 is a deficient number, since it is larger than the sum of its proper divisors (54263548).

72157292 is a wasteful number, since it uses less digits than its factorization.

72157292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20800 (or 20798 counting only the distinct ones).

The product of its digits is 17640, while the sum is 35.

The square root of 72157292 is about 8494.5448377179. The cubic root of 72157292 is about 416.3194892209.

The spelling of 72157292 in words is "seventy-two million, one hundred fifty-seven thousand, two hundred ninety-two".