90931485840 has 160 divisors (see below), whose sum is σ = 304131950976. Its totient is φ = 22341795840.

The previous prime is 90931485829. The next prime is 90931485859. The reversal of 90931485840 is 4858413909.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1680000 + ... + 1733280.

Almost surely, 2^90931485840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90931485840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152065975488).

90931485840 is an abundant number, since it is smaller than the sum of its proper divisors (213200465136).

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

90931485840 is a wasteful number, since it uses less digits than its factorization.

90931485840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53857 (or 53851 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 90931485840 in words is "ninety billion, nine hundred thirty-one million, four hundred eighty-five thousand, eight hundred forty".