72666587 has 4 divisors (see below), whose sum is σ = 83047536. Its totient is φ = 62285640.

The previous prime is 72666569. The next prime is 72666599. The reversal of 72666587 is 78566627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78566627 = 1879 ⋅41813.

It is a cyclic number.

It is not a de Polignac number, because 72666587 - 2⁸ = 72666331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72660587) 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, 5190464 + ... + 5190477.

It is an arithmetic number, because the mean of its divisors is an integer number (20761884).

Almost surely, 2^72666587 is an apocalyptic number.

72666587 is a deficient number, since it is larger than the sum of its proper divisors (10380949).

72666587 is a wasteful number, since it uses less digits than its factorization.

72666587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10380948.

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

The square root of 72666587 is about 8524.4698955419. The cubic root of 72666587 is about 417.2966717623.

The spelling of 72666587 in words is "seventy-two million, six hundred sixty-six thousand, five hundred eighty-seven".