90445880 has 64 divisors (see below), whose sum is σ = 233763840. Its totient is φ = 30851712.

The previous prime is 90445843. The next prime is 90445891. The reversal of 90445880 is 8854409.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62849 + ... + 64271.

It is an arithmetic number, because the mean of its divisors is an integer number (3652560).

Almost surely, 2^90445880 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 90445880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116881920).

90445880 is an abundant number, since it is smaller than the sum of its proper divisors (143317960).

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

90445880 is a wasteful number, since it uses less digits than its factorization.

90445880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668 (or 1664 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 90445880 is about 9510.3038857862. The cubic root of 90445880 is about 448.8793183631.

The spelling of 90445880 in words is "ninety million, four hundred forty-five thousand, eight hundred eighty".