90931903840 has 192 divisors, whose sum is σ = 231383900160. Its totient is φ = 33646305280.

The previous prime is 90931903819. The next prime is 90931903859. The reversal of 90931903840 is 4830913909.

It is a super-2 number, since 2×90931903840² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92503989 + ... + 92504971.

It is an arithmetic number, because the mean of its divisors is an integer number (1205124480).

Almost surely, 2^90931903840 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 90931903840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115691950080).

90931903840 is an abundant number, since it is smaller than the sum of its proper divisors (140451996320).

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

90931903840 is a wasteful number, since it uses less digits than its factorization.

90931903840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 46.

The spelling of 90931903840 in words is "ninety billion, nine hundred thirty-one million, nine hundred three thousand, eight hundred forty".