72560521 has 16 divisors (see below), whose sum is σ = 80568576. Its totient is φ = 64800000.

The previous prime is 72560503. The next prime is 72560557. The reversal of 72560521 is 12506527.

It is a 5-Lehmer number, since φ(72560521) divides (72560521-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 72560521 - 2¹⁹ = 72036233 is a prime.

It is a deceptive number, since it divides R_72560520.

It is a self number, because there is not a number n which added to its sum of digits gives 72560521.

It is not an unprimeable number, because it can be changed into a prime (72561521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267616 + ... + 267886.

It is an arithmetic number, because the mean of its divisors is an integer number (5035536).

Almost surely, 2^72560521 is an apocalyptic number.

It is an amenable number.

72560521 is a deficient number, since it is larger than the sum of its proper divisors (8008055).

72560521 is a wasteful number, since it uses less digits than its factorization.

72560521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 72560521 is about 8518.2463570855. The cubic root of 72560521 is about 417.0935406171.

The spelling of 72560521 in words is "seventy-two million, five hundred sixty thousand, five hundred twenty-one".