72604621 has 4 divisors (see below), whose sum is σ = 72646272. Its totient is φ = 72562972.

The previous prime is 72604607. The next prime is 72604667. The reversal of 72604621 is 12640627.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12640627 = 71 ⋅178037.

It is a cyclic number.

It is not a de Polignac number, because 72604621 - 2⁵ = 72604589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72604621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72604691) 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, 18091 + ... + 21736.

It is an arithmetic number, because the mean of its divisors is an integer number (18161568).

Almost surely, 2^72604621 is an apocalyptic number.

It is an amenable number.

72604621 is a deficient number, since it is larger than the sum of its proper divisors (41651).

72604621 is a wasteful number, since it uses less digits than its factorization.

72604621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41650.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 72604621 is about 8520.8345248573. The cubic root of 72604621 is about 417.1780222781.

It can be divided in two parts, 7260 and 4621, that added together give a square (11881 = 109²).

The spelling of 72604621 in words is "seventy-two million, six hundred four thousand, six hundred twenty-one".