72331424 has 24 divisors (see below), whose sum is σ = 155348928. Its totient is φ = 32877760.

The previous prime is 72331409. The next prime is 72331459. The reversal of 72331424 is 42413327.

It is a junction number, because it is equal to n+sod(n) for n = 72331393 and 72331402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102392 + ... + 103095.

It is an arithmetic number, because the mean of its divisors is an integer number (6472872).

Almost surely, 2^72331424 is an apocalyptic number.

It is an amenable number.

72331424 is an abundant number, since it is smaller than the sum of its proper divisors (83017504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72331424 is a wasteful number, since it uses less digits than its factorization.

72331424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205508 (or 205500 counting only the distinct ones).

The product of its digits is 4032, while the sum is 26.

The square root of 72331424 is about 8504.7882983646. The cubic root of 72331424 is about 416.6541114795.

The spelling of 72331424 in words is "seventy-two million, three hundred thirty-one thousand, four hundred twenty-four".