90899880 has 128 divisors (see below), whose sum is σ = 283668480. Its totient is φ = 23287040.

The previous prime is 90899839. The next prime is 90899881. The reversal of 90899880 is 8899809.

It is not an unprimeable number, because it can be changed into a prime (90899881) 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, 400327 + ... + 400553.

It is an arithmetic number, because the mean of its divisors is an integer number (2216160).

Almost surely, 2^90899880 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 90899880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141834240).

90899880 is an abundant number, since it is smaller than the sum of its proper divisors (192768600).

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

90899880 is a wasteful number, since it uses less digits than its factorization.

90899880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 51.

The square root of 90899880 is about 9534.1428560726. The cubic root of 90899880 is about 449.6291265224.

The spelling of 90899880 in words is "ninety million, eight hundred ninety-nine thousand, eight hundred eighty".