90491850 has 96 divisors (see below), whose sum is σ = 264090240. Its totient is φ = 22705920.

The previous prime is 90491837. The next prime is 90491857. The reversal of 90491850 is 5819409.

90491850 is a `hidden beast` number, since 90 + 491 + 85 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (90491857) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20979 + ... + 24921.

It is an arithmetic number, because the mean of its divisors is an integer number (2750940).

Almost surely, 2^90491850 is an apocalyptic number.

90491850 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 90491850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132045120).

90491850 is an abundant number, since it is smaller than the sum of its proper divisors (173598390).

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

90491850 is a wasteful number, since it uses less digits than its factorization.

90491850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3981 (or 3970 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 90491850 is about 9512.7204310859. The cubic root of 90491850 is about 448.9553545786.

The spelling of 90491850 in words is "ninety million, four hundred ninety-one thousand, eight hundred fifty".