90989880 has 64 divisors (see below), whose sum is σ = 275819040. Its totient is φ = 24010752.

The previous prime is 90989839. The next prime is 90989887. The reversal of 90989880 is 8898909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90989887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7732 + ... + 15548.

Almost surely, 2^90989880 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 90989880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137909520).

90989880 is an abundant number, since it is smaller than the sum of its proper divisors (184829160).

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

90989880 is a wasteful number, since it uses less digits than its factorization.

90989880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7928 (or 7924 counting only the distinct ones).

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

The square root of 90989880 is about 9538.8615672941. The cubic root of 90989880 is about 449.7774702217. Note that the first 3 decimals are identical.

The spelling of 90989880 in words is "ninety million, nine hundred eighty-nine thousand, eight hundred eighty".