90721812480 has 544 divisors, whose sum is σ = 324133340160. Its totient is φ = 21516779520.

The previous prime is 90721812403. The next prime is 90721812481. The reversal of 90721812480 is 8421812709.

It is not an unprimeable number, because it can be changed into a prime (90721812481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396165006 + ... + 396165234.

Almost surely, 2^90721812480 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 90721812480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162066670080).

90721812480 is an abundant number, since it is smaller than the sum of its proper divisors (233411527680).

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

90721812480 is a wasteful number, since it uses less digits than its factorization.

90721812480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The spelling of 90721812480 in words is "ninety billion, seven hundred twenty-one million, eight hundred twelve thousand, four hundred eighty".