72231288 has 16 divisors (see below), whose sum is σ = 180578280. Its totient is φ = 24077088.

The previous prime is 72231287. The next prime is 72231307. The reversal of 72231288 is 88213227.

It is a super-2 number, since 2×72231288² = 10434717932277888, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72231287) 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, 1504795 + ... + 1504842.

Almost surely, 2^72231288 is an apocalyptic number.

It is an amenable number.

72231288 is an abundant number, since it is smaller than the sum of its proper divisors (108346992).

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

72231288 is a wasteful number, since it uses less digits than its factorization.

72231288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3009646 (or 3009642 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 72231288 is about 8498.8992228406. The cubic root of 72231288 is about 416.4617499763.

The spelling of 72231288 in words is "seventy-two million, two hundred thirty-one thousand, two hundred eighty-eight".