90022215920 has 320 divisors, whose sum is σ = 266537107200. Its totient is φ = 28092137472.

The previous prime is 90022215917. The next prime is 90022215961. The reversal of 90022215920 is 2951222009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26038832 + ... + 26042288.

It is an arithmetic number, because the mean of its divisors is an integer number (832928460).

Almost surely, 2^90022215920 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 90022215920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133268553600).

90022215920 is an abundant number, since it is smaller than the sum of its proper divisors (176514891280).

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

90022215920 is a wasteful number, since it uses less digits than its factorization.

90022215920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3577 (or 3557 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

Adding to 90022215920 its reverse (2951222009), we get a palindrome (92973437929).

The spelling of 90022215920 in words is "ninety billion, twenty-two million, two hundred fifteen thousand, nine hundred twenty".