90203904 has 324 divisors, whose sum is σ = 327154464. Its totient is φ = 23740416.

The previous prime is 90203899. The next prime is 90203917. The reversal of 90203904 is 40930209.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1919209 + ... + 1919255.

It is an arithmetic number, because the mean of its divisors is an integer number (1009736).

Almost surely, 2^90203904 is an apocalyptic number.

90203904 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90203904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163577232).

90203904 is an abundant number, since it is smaller than the sum of its proper divisors (236950560).

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

90203904 is a wasteful number, since it uses less digits than its factorization.

90203904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 90203904 is about 9497.5735848689. The cubic root of 90203904 is about 448.4786550768.

The spelling of 90203904 in words is "ninety million, two hundred three thousand, nine hundred four".