90928131840 has 648 divisors, whose sum is σ = 394148428128. Its totient is φ = 19183288320.

The previous prime is 90928131839. The next prime is 90928131859. The reversal of 90928131840 is 4813182909.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7332045 + ... + 7344435.

Almost surely, 2^90928131840 is an apocalyptic number.

90928131840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90928131840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197074214064).

90928131840 is an abundant number, since it is smaller than the sum of its proper divisors (303220296288).

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

90928131840 is a wasteful number, since it uses less digits than its factorization.

90928131840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12445 (or 12421 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 90928131840 in words is "ninety billion, nine hundred twenty-eight million, one hundred thirty-one thousand, eight hundred forty".