72687556 has 6 divisors (see below), whose sum is σ = 127203230. Its totient is φ = 36343776.

The previous prime is 72687553. The next prime is 72687581. The reversal of 72687556 is 65578627.

It can be written as a sum of positive squares in only one way, i.e., 67240000 + 5447556 = 8200^2 + 2334^2 .

It is not an unprimeable number, because it can be changed into a prime (72687551) by changing a digit.

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 as a sum of consecutive naturals, namely, 9085941 + ... + 9085948.

Almost surely, 2^72687556 is an apocalyptic number.

It is an amenable number.

72687556 is a deficient number, since it is larger than the sum of its proper divisors (54515674).

72687556 is a wasteful number, since it uses less digits than its factorization.

72687556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18171893 (or 18171891 counting only the distinct ones).

The product of its digits is 705600, while the sum is 46.

The square root of 72687556 is about 8525.6997366785. The cubic root of 72687556 is about 417.3368069089.

The spelling of 72687556 in words is "seventy-two million, six hundred eighty-seven thousand, five hundred fifty-six".