72638866 has 8 divisors (see below), whose sum is σ = 109004544. Its totient is φ = 36304020.

The previous prime is 72638851. The next prime is 72638941. The reversal of 72638866 is 66883627.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450 + ... + 12061.

It is an arithmetic number, because the mean of its divisors is an integer number (13625568).

Almost surely, 2^72638866 is an apocalyptic number.

72638866 is a deficient number, since it is larger than the sum of its proper divisors (36365678).

72638866 is a wasteful number, since it uses less digits than its factorization.

72638866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15416.

The product of its digits is 580608, while the sum is 46.

The square root of 72638866 is about 8522.8437742340. The cubic root of 72638866 is about 417.2436012806.

It can be divided in two parts, 7263 and 8866, that added together give a square (16129 = 127²).

The spelling of 72638866 in words is "seventy-two million, six hundred thirty-eight thousand, eight hundred sixty-six".