72218024 has 16 divisors (see below), whose sum is σ = 137264820. Its totient is φ = 35614080.

The previous prime is 72218021. The next prime is 72218039. The reversal of 72218024 is 42081227.

It can be written as a sum of positive squares in 2 ways, for example, as 69388900 + 2829124 = 8330^2 + 1682^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72217984 and 72218002.

It is not an unprimeable number, because it can be changed into a prime (72218021) 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, 61247 + ... + 62414.

Almost surely, 2^72218024 is an apocalyptic number.

It is an amenable number.

72218024 is a deficient number, since it is larger than the sum of its proper divisors (65046796).

72218024 is a wasteful number, since it uses less digits than its factorization.

72218024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123740 (or 123736 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 72218024 is about 8498.1188506634. The cubic root of 72218024 is about 416.4362564680.

The spelling of 72218024 in words is "seventy-two million, two hundred eighteen thousand, twenty-four".