90189878520 has 128 divisors (see below), whose sum is σ = 319197450240. Its totient is φ = 19949829120.

The previous prime is 90189878503. The next prime is 90189878521. The reversal of 90189878520 is 2587898109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90189878521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1705717 + ... + 1757796.

It is an arithmetic number, because the mean of its divisors is an integer number (2493730080).

Almost surely, 2^90189878520 is an apocalyptic number.

It is an amenable number.

90189878520 is an abundant number, since it is smaller than the sum of its proper divisors (229007571720).

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

90189878520 is a wasteful number, since it uses less digits than its factorization.

90189878520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463565 (or 3463561 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 57.

The spelling of 90189878520 in words is "ninety billion, one hundred eighty-nine million, eight hundred seventy-eight thousand, five hundred twenty".