87907689 has 6 divisors (see below), whose sum is σ = 126977786. Its totient is φ = 58605120.

The previous prime is 87907657. The next prime is 87907709. The reversal of 87907689 is 98670978.

It can be written as a sum of positive squares in only one way, i.e., 78907689 + 9000000 = 8883^2 + 3000^2 .

It is not a de Polignac number, because 87907689 - 2⁵ = 87907657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87907639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4883752 + ... + 4883769.

Almost surely, 2^87907689 is an apocalyptic number.

It is an amenable number.

87907689 is a deficient number, since it is larger than the sum of its proper divisors (39070097).

87907689 is a wasteful number, since it uses less digits than its factorization.

87907689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9767527 (or 9767524 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 87907689 is about 9375.9100358312. The cubic root of 87907689 is about 444.6404350434.

The spelling of 87907689 in words is "eighty-seven million, nine hundred seven thousand, six hundred eighty-nine".