72265521 has 16 divisors (see below), whose sum is σ = 103019904. Its totient is φ = 44899584.

The previous prime is 72265511. The next prime is 72265549. The reversal of 72265521 is 12556227.

It is not a de Polignac number, because 72265521 - 2¹⁵ = 72232753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72265511) 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, 1626 + ... + 12131.

It is an arithmetic number, because the mean of its divisors is an integer number (6438744).

Almost surely, 2^72265521 is an apocalyptic number.

It is an amenable number.

72265521 is a deficient number, since it is larger than the sum of its proper divisors (30754383).

72265521 is a wasteful number, since it uses less digits than its factorization.

72265521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13880.

The product of its digits is 8400, while the sum is 30.

The square root of 72265521 is about 8500.9129509718. The cubic root of 72265521 is about 416.5275316424.

The spelling of 72265521 in words is "seventy-two million, two hundred sixty-five thousand, five hundred twenty-one".