72522381 has 16 divisors (see below), whose sum is σ = 103251456. Its totient is φ = 45168816.

The previous prime is 72522377. The next prime is 72522397. The reversal of 72522381 is 18322527.

It is not a de Polignac number, because 72522381 - 2² = 72522377 is a prime.

It is a super-2 number, since 2×72522381² = 10518991491818322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72522181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9255 + ... + 15188.

It is an arithmetic number, because the mean of its divisors is an integer number (6453216).

Almost surely, 2^72522381 is an apocalyptic number.

It is an amenable number.

72522381 is a deficient number, since it is larger than the sum of its proper divisors (30729075).

72522381 is a wasteful number, since it uses less digits than its factorization.

72522381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24512.

The product of its digits is 6720, while the sum is 30.

The square root of 72522381 is about 8516.0073391232. The cubic root of 72522381 is about 417.0204488244.

The spelling of 72522381 in words is "seventy-two million, five hundred twenty-two thousand, three hundred eighty-one".