90521297920 has 88 divisors (see below), whose sum is σ = 217248732288. Its totient is φ = 36191232000.

The previous prime is 90521297899. The next prime is 90521297947. The reversal of 90521297920 is 2979212509.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19714825 + ... + 19719415.

Almost surely, 2^90521297920 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 90521297920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108624366144).

90521297920 is an abundant number, since it is smaller than the sum of its proper divisors (126727434368).

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

90521297920 is a wasteful number, since it uses less digits than its factorization.

90521297920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8467 (or 8449 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 90521297920 in words is "ninety billion, five hundred twenty-one million, two hundred ninety-seven thousand, nine hundred twenty".