72686756 has 12 divisors (see below), whose sum is σ = 128513868. Its totient is φ = 35968512.

The previous prime is 72686749. The next prime is 72686767. The reversal of 72686756 is 65768627.

It can be written as a sum of positive squares in 2 ways, for example, as 17926756 + 54760000 = 4234^2 + 7400^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 72686756.

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, 93281 + ... + 94056.

It is an arithmetic number, because the mean of its divisors is an integer number (10709489).

Almost surely, 2^72686756 is an apocalyptic number.

It is an amenable number.

72686756 is a deficient number, since it is larger than the sum of its proper divisors (55827112).

72686756 is a wasteful number, since it uses less digits than its factorization.

72686756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187438 (or 187436 counting only the distinct ones).

The product of its digits is 846720, while the sum is 47.

The square root of 72686756 is about 8525.6528195793. The cubic root of 72686756 is about 417.3352758322.

The spelling of 72686756 in words is "seventy-two million, six hundred eighty-six thousand, seven hundred fifty-six".