87655579 has 4 divisors (see below), whose sum is σ = 95624280. Its totient is φ = 79686880.

The previous prime is 87655559. The next prime is 87655583. The reversal of 87655579 is 97555678.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87655579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87655549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3984334 + ... + 3984355.

It is an arithmetic number, because the mean of its divisors is an integer number (23906070).

Almost surely, 2^87655579 is an apocalyptic number.

87655579 is a deficient number, since it is larger than the sum of its proper divisors (7968701).

87655579 is a wasteful number, since it uses less digits than its factorization.

87655579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7968700.

The product of its digits is 2646000, while the sum is 52.

The square root of 87655579 is about 9362.4558209906. The cubic root of 87655579 is about 444.2149673948.

Subtracting 87655579 from its reverse (97555678), we obtain a palindrome (9900099).

The spelling of 87655579 in words is "eighty-seven million, six hundred fifty-five thousand, five hundred seventy-nine".