72531394 has 8 divisors (see below), whose sum is σ = 117166140. Its totient is φ = 33476016.

The previous prime is 72531377. The next prime is 72531421. The reversal of 72531394 is 49313527.

It can be written as a sum of positive squares in 2 ways, for example, as 64208169 + 8323225 = 8013^2 + 2885^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394809 + ... + 1394860.

Almost surely, 2^72531394 is an apocalyptic number.

72531394 is a deficient number, since it is larger than the sum of its proper divisors (44634746).

72531394 is a wasteful number, since it uses less digits than its factorization.

72531394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789684.

The product of its digits is 22680, while the sum is 34.

The square root of 72531394 is about 8516.5365025931. The cubic root of 72531394 is about 417.0377237197.

The spelling of 72531394 in words is "seventy-two million, five hundred thirty-one thousand, three hundred ninety-four".