72584921 has 4 divisors (see below), whose sum is σ = 76405200. Its totient is φ = 68764644.

The previous prime is 72584899. The next prime is 72584923. The reversal of 72584921 is 12948527.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72584921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72584923) 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, 1910111 + ... + 1910148.

It is an arithmetic number, because the mean of its divisors is an integer number (19101300).

Almost surely, 2^72584921 is an apocalyptic number.

It is an amenable number.

72584921 is a deficient number, since it is larger than the sum of its proper divisors (3820279).

72584921 is a wasteful number, since it uses less digits than its factorization.

72584921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3820278.

The product of its digits is 40320, while the sum is 38.

The square root of 72584921 is about 8519.6784563738. The cubic root of 72584921 is about 417.1402875337.

The spelling of 72584921 in words is "seventy-two million, five hundred eighty-four thousand, nine hundred twenty-one".