72576421 has 4 divisors (see below), whose sum is σ = 72682144. Its totient is φ = 72470700.

The previous prime is 72576407. The next prime is 72576433. The reversal of 72576421 is 12467527.

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: 12467527 = 157 ⋅79411.

It is a cyclic number.

It is not a de Polignac number, because 72576421 - 2¹⁷ = 72445349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72576401) 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, 51825 + ... + 53206.

It is an arithmetic number, because the mean of its divisors is an integer number (18170536).

Almost surely, 2^72576421 is an apocalyptic number.

It is an amenable number.

72576421 is a deficient number, since it is larger than the sum of its proper divisors (105723).

72576421 is a wasteful number, since it uses less digits than its factorization.

72576421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105722.

The product of its digits is 23520, while the sum is 34.

The square root of 72576421 is about 8519.1795966513. The cubic root of 72576421 is about 417.1240039364.

The spelling of 72576421 in words is "seventy-two million, five hundred seventy-six thousand, four hundred twenty-one".