72531918 has 24 divisors (see below), whose sum is σ = 157950000. Its totient is φ = 24054624.

The previous prime is 72531913. The next prime is 72531923. The reversal of 72531918 is 81913527.

It is an interprime number because it is at equal distance from previous prime (72531913) and next prime (72531923).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72531913) 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, 6543 + ... + 13706.

It is an arithmetic number, because the mean of its divisors is an integer number (6581250).

Almost surely, 2^72531918 is an apocalyptic number.

72531918 is an abundant number, since it is smaller than the sum of its proper divisors (85418082).

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

72531918 is a wasteful number, since it uses less digits than its factorization.

72531918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20456 (or 20453 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 72531918 is about 8516.5672662171. The cubic root of 72531918 is about 417.0387280077.

The spelling of 72531918 in words is "seventy-two million, five hundred thirty-one thousand, nine hundred eighteen".