72316520 has 16 divisors (see below), whose sum is σ = 162712260. Its totient is φ = 28926592.

The previous prime is 72316513. The next prime is 72316523. The reversal of 72316520 is 2561327.

It can be written as a sum of positive squares in 2 ways, for example, as 59197636 + 13118884 = 7694^2 + 3622^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72316520.

It is not an unprimeable number, because it can be changed into a prime (72316523) 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, 903917 + ... + 903996.

Almost surely, 2^72316520 is an apocalyptic number.

It is an amenable number.

72316520 is an abundant number, since it is smaller than the sum of its proper divisors (90395740).

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

72316520 is a wasteful number, since it uses less digits than its factorization.

72316520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807924 (or 1807920 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 72316520 is about 8503.9120409374. The cubic root of 72316520 is about 416.6254921091.

Adding to 72316520 its reverse (2561327), we get a palindrome (74877847).

The spelling of 72316520 in words is "seventy-two million, three hundred sixteen thousand, five hundred twenty".