72397224 has 48 divisors (see below), whose sum is σ = 202842900. Its totient is φ = 23299584.

The previous prime is 72397223. The next prime is 72397231. The reversal of 72397224 is 42279327.

It can be written as a sum of positive squares in 2 ways, for example, as 68062500 + 4334724 = 8250^2 + 2082^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (72397223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15249 + ... + 19424.

Almost surely, 2^72397224 is an apocalyptic number.

It is an amenable number.

72397224 is an abundant number, since it is smaller than the sum of its proper divisors (130445676).

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

72397224 is a wasteful number, since it uses less digits than its factorization.

72397224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34714 (or 34707 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 72397224 is about 8508.6558280377. The cubic root of 72397224 is about 416.7804168011.

The spelling of 72397224 in words is "seventy-two million, three hundred ninety-seven thousand, two hundred twenty-four".