872661657 has 16 divisors (see below), whose sum is σ = 1335484800. Its totient is φ = 496520832.

The previous prime is 872661611. The next prime is 872661689. The reversal of 872661657 is 756166278.

It is not a de Polignac number, because 872661657 - 2⁷ = 872661529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (872661157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84282 + ... + 94067.

It is an arithmetic number, because the mean of its divisors is an integer number (83467800).

Almost surely, 2^872661657 is an apocalyptic number.

It is an amenable number.

872661657 is a deficient number, since it is larger than the sum of its proper divisors (462823143).

872661657 is a wasteful number, since it uses less digits than its factorization.

872661657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178592.

The product of its digits is 846720, while the sum is 48.

The square root of 872661657 is about 29540.8472627310. The cubic root of 872661657 is about 955.6128142847.

The spelling of 872661657 in words is "eight hundred seventy-two million, six hundred sixty-one thousand, six hundred fifty-seven".