90578863585864 has 8 divisors (see below), whose sum is σ = 169835369223510. Its totient is φ = 45289431792928.

The previous prime is 90578863585787. The next prime is 90578863585871. The reversal of 90578863585864 is 46858536887509.

It can be written as a sum of positive squares in only one way, i.e., 49343740740100 + 41235122845764 = 7024510^2 + 6421458^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5661178974109 + ... + 5661178974124.

Almost surely, 2^{90578863585864} is an apocalyptic number.

It is an amenable number.

90578863585864 is a deficient number, since it is larger than the sum of its proper divisors (79256505637646).

90578863585864 is a wasteful number, since it uses less digits than its factorization.

90578863585864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11322357948239 (or 11322357948235 counting only the distinct ones).

The product of its (nonzero) digits is 13934592000, while the sum is 82.

The spelling of 90578863585864 in words is "ninety trillion, five hundred seventy-eight billion, eight hundred sixty-three million, five hundred eighty-five thousand, eight hundred sixty-four".