72212520 has 32 divisors (see below), whose sum is σ = 216637920. Its totient is φ = 19256640.

The previous prime is 72212509. The next prime is 72212551. The reversal of 72212520 is 2521227.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300766 + ... + 301005.

It is an arithmetic number, because the mean of its divisors is an integer number (6769935).

Almost surely, 2^72212520 is an apocalyptic number.

It is an amenable number.

72212520 is an abundant number, since it is smaller than the sum of its proper divisors (144425400).

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

72212520 is a wasteful number, since it uses less digits than its factorization.

72212520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601785 (or 601781 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 72212520 is about 8497.7950081183. The cubic root of 72212520 is about 416.4256768220.

Adding to 72212520 its reverse (2521227), we get a palindrome (74733747).

The spelling of 72212520 in words is "seventy-two million, two hundred twelve thousand, five hundred twenty".