72218504 has 16 divisors (see below), whose sum is σ = 136195020. Its totient is φ = 35899840.

The previous prime is 72218501. The next prime is 72218513. The reversal of 72218504 is 40581227.

It can be written as a sum of positive squares in 2 ways, for example, as 72216004 + 2500 = 8498^2 + 50^2 .

It is not an unprimeable number, because it can be changed into a prime (72218501) 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, 24707 + ... + 27474.

Almost surely, 2^72218504 is an apocalyptic number.

It is an amenable number.

72218504 is a deficient number, since it is larger than the sum of its proper divisors (63976516).

72218504 is a wasteful number, since it uses less digits than its factorization.

72218504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52360 (or 52356 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 72218504 is about 8498.1470921607. The cubic root of 72218504 is about 416.4371790861.

The spelling of 72218504 in words is "seventy-two million, two hundred eighteen thousand, five hundred four".