90491904 has 110 divisors (see below), whose sum is σ = 270474204. Its totient is φ = 30136320.

The previous prime is 90491887. The next prime is 90491923. The reversal of 90491904 is 40919409.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 82399 + ... + 83489.

Almost surely, 2^90491904 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 90491904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135237102).

90491904 is an abundant number, since it is smaller than the sum of its proper divisors (179982300).

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

90491904 is a wasteful number, since it uses less digits than its factorization.

90491904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 90491904 is about 9512.7232693903. The cubic root of 90491904 is about 448.9554438817.

The spelling of 90491904 in words is "ninety million, four hundred ninety-one thousand, nine hundred four".