72240858 has 24 divisors (see below), whose sum is σ = 156705588. Its totient is φ = 24052032.

The previous prime is 72240853. The next prime is 72240863. The reversal of 72240858 is 85804227.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72240853) and next prime (72240863).

It can be written as a sum of positive squares in 2 ways, for example, as 62299449 + 9941409 = 7893^2 + 3153^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72240853) 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, 18310 + ... + 21902.

Almost surely, 2^72240858 is an apocalyptic number.

72240858 is an abundant number, since it is smaller than the sum of its proper divisors (84464730).

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

72240858 is a wasteful number, since it uses less digits than its factorization.

72240858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4718 (or 4715 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 72240858 is about 8499.4622182818. The cubic root of 72240858 is about 416.4801416504.

The spelling of 72240858 in words is "seventy-two million, two hundred forty thousand, eight hundred fifty-eight".