87787665 has 96 divisors (see below), whose sum is σ = 189768960. Its totient is φ = 38320128.

The previous prime is 87787631. The next prime is 87787673. The reversal of 87787665 is 56678778.

It is not a de Polignac number, because 87787665 - 2⁸ = 87787409 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 151857 + ... + 152433.

It is an arithmetic number, because the mean of its divisors is an integer number (1976760).

Almost surely, 2^87787665 is an apocalyptic number.

It is an amenable number.

87787665 is an abundant number, since it is smaller than the sum of its proper divisors (101981295).

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

87787665 is a wasteful number, since it uses less digits than its factorization.

87787665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 615 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 54.

The square root of 87787665 is about 9369.5071908826. The cubic root of 87787665 is about 444.4379808898.

The spelling of 87787665 in words is "eighty-seven million, seven hundred eighty-seven thousand, six hundred sixty-five".