90890910 has 120 divisors (see below), whose sum is σ = 269279208. Its totient is φ = 21816000.

The previous prime is 90890909. The next prime is 90890929. The reversal of 90890910 is 1909809.

It is a super-2 number, since 2×90890910² = 16522315041256200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 899860 + ... + 899960.

Almost surely, 2^90890910 is an apocalyptic number.

90890910 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 90890910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134639604).

90890910 is an abundant number, since it is smaller than the sum of its proper divisors (178388298).

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

90890910 is a wasteful number, since it uses less digits than its factorization.

90890910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 90890910 is about 9533.6724298667. The cubic root of 90890910 is about 449.6143362354.

The spelling of 90890910 in words is "ninety million, eight hundred ninety thousand, nine hundred ten".