87690864 has 20 divisors (see below), whose sum is σ = 226534856. Its totient is φ = 29230272.

The previous prime is 87690859. The next prime is 87690877. The reversal of 87690864 is 46809678.

87690864 = 402² + 403² + ... + 689².

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1826893 = 87690864 / (8 + 7 + 6 + 9 + 0 + 8 + 6 + 4).

It is a congruent number.

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, 913399 + ... + 913494.

Almost surely, 2^87690864 is an apocalyptic number.

It is an amenable number.

87690864 is an abundant number, since it is smaller than the sum of its proper divisors (138843992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87690864 is a wasteful number, since it uses less digits than its factorization.

87690864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826904 (or 1826898 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 87690864 is about 9364.3400194568. The cubic root of 87690864 is about 444.2745643713.

The spelling of 87690864 in words is "eighty-seven million, six hundred ninety thousand, eight hundred sixty-four".