72866659 has 4 divisors (see below), whose sum is σ = 72908920. Its totient is φ = 72824400.

The previous prime is 72866623. The next prime is 72866699. The reversal of 72866659 is 95666827.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72866659 - 2²⁵ = 39312227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72866699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18429 + ... + 22030.

It is an arithmetic number, because the mean of its divisors is an integer number (18227230).

Almost surely, 2^72866659 is an apocalyptic number.

72866659 is a deficient number, since it is larger than the sum of its proper divisors (42261).

72866659 is a wasteful number, since it uses less digits than its factorization.

72866659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42260.

The product of its digits is 1088640, while the sum is 49.

The square root of 72866659 is about 8536.1969869492. The cubic root of 72866659 is about 417.6793000408.

The spelling of 72866659 in words is "seventy-two million, eight hundred sixty-six thousand, six hundred fifty-nine".