90556688587 has 4 divisors (see below), whose sum is σ = 91574179560. Its totient is φ = 89539197616.

The previous prime is 90556688581. The next prime is 90556688623. The reversal of 90556688587 is 78588665509.

It is a happy number.

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-90556688587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90556688581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508745353 + ... + 508745530.

It is an arithmetic number, because the mean of its divisors is an integer number (22893544890).

Almost surely, 2^90556688587 is an apocalyptic number.

90556688587 is a deficient number, since it is larger than the sum of its proper divisors (1017490973).

90556688587 is a wasteful number, since it uses less digits than its factorization.

90556688587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017490972.

The product of its (nonzero) digits is 145152000, while the sum is 67.

The spelling of 90556688587 in words is "ninety billion, five hundred fifty-six million, six hundred eighty-eight thousand, five hundred eighty-seven".