72237978 has 24 divisors (see below), whose sum is σ = 157061268. Its totient is φ = 23995392.

The previous prime is 72237961. The next prime is 72238039. The reversal of 72237978 is 87973227.

It can be written as a sum of positive squares in 2 ways, for example, as 72131049 + 106929 = 8493^2 + 327^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1575 + ... + 12122.

Almost surely, 2^72237978 is an apocalyptic number.

72237978 is an abundant number, since it is smaller than the sum of its proper divisors (84823290).

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

72237978 is a wasteful number, since it uses less digits than its factorization.

72237978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13998 (or 13995 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 72237978 is about 8499.2927941094. The cubic root of 72237978 is about 416.4746070228.

The spelling of 72237978 in words is "seventy-two million, two hundred thirty-seven thousand, nine hundred seventy-eight".