72513922 has 8 divisors (see below), whose sum is σ = 117137916. Its totient is φ = 33467952.

The previous prime is 72513887. The next prime is 72513923. The reversal of 72513922 is 22931527.

It can be written as a sum of positive squares in 2 ways, for example, as 68707521 + 3806401 = 8289^2 + 1951^2 .

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

It is not an unprimeable number, because it can be changed into a prime (72513923) by changing a digit.

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, 1394473 + ... + 1394524.

Almost surely, 2^72513922 is an apocalyptic number.

72513922 is a deficient number, since it is larger than the sum of its proper divisors (44623994).

72513922 is a wasteful number, since it uses less digits than its factorization.

72513922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789012.

The product of its digits is 7560, while the sum is 31.

The square root of 72513922 is about 8515.5106717096. The cubic root of 72513922 is about 417.0042344591.

The spelling of 72513922 in words is "seventy-two million, five hundred thirteen thousand, nine hundred twenty-two".