72687566 has 16 divisors (see below), whose sum is σ = 125076960. Its totient is φ = 31034400.

The previous prime is 72687553. The next prime is 72687581. The reversal of 72687566 is 66578627.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72687566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5885 + ... + 13416.

It is an arithmetic number, because the mean of its divisors is an integer number (7817310).

Almost surely, 2^72687566 is an apocalyptic number.

72687566 is a deficient number, since it is larger than the sum of its proper divisors (52389394).

72687566 is a wasteful number, since it uses less digits than its factorization.

72687566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19579.

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

The square root of 72687566 is about 8525.7003231406. The cubic root of 72687566 is about 417.3368260473.

The spelling of 72687566 in words is "seventy-two million, six hundred eighty-seven thousand, five hundred sixty-six".