72224881 has 4 divisors (see below), whose sum is σ = 73139200. Its totient is φ = 71310564.

The previous prime is 72224879. The next prime is 72224921. The reversal of 72224881 is 18842227.

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: 18842227 = 1093 ⋅17239.

It is a cyclic number.

It is not a de Polignac number, because 72224881 - 2¹ = 72224879 is a prime.

It is a super-2 number, since 2×72224881² = 10432866870928322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72224981) 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, 457041 + ... + 457198.

It is an arithmetic number, because the mean of its divisors is an integer number (18284800).

Almost surely, 2^72224881 is an apocalyptic number.

It is an amenable number.

72224881 is a deficient number, since it is larger than the sum of its proper divisors (914319).

72224881 is an equidigital number, since it uses as much as digits as its factorization.

72224881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914318.

The product of its digits is 14336, while the sum is 34.

The square root of 72224881 is about 8498.5222833149. The cubic root of 72224881 is about 416.4494360635.

The spelling of 72224881 in words is "seventy-two million, two hundred twenty-four thousand, eight hundred eighty-one".