90894721320 has 256 divisors, whose sum is σ = 327654835200. Its totient is φ = 22280417280.

The previous prime is 90894721289. The next prime is 90894721399. The reversal of 90894721320 is 2312749809.

90894721320 is a `hidden beast` number, since 90 + 89 + 472 + 13 + 2 + 0 = 666.

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

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, 3370209 + ... + 3397071.

It is an arithmetic number, because the mean of its divisors is an integer number (1279901700).

Almost surely, 2^90894721320 is an apocalyptic number.

90894721320 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 90894721320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163827417600).

90894721320 is an abundant number, since it is smaller than the sum of its proper divisors (236760113880).

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

90894721320 is a wasteful number, since it uses less digits than its factorization.

90894721320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27137 (or 27127 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 90894721320 in words is "ninety billion, eight hundred ninety-four million, seven hundred twenty-one thousand, three hundred twenty".