90143904 has 96 divisors (see below), whose sum is σ = 252866880. Its totient is φ = 28035072.

The previous prime is 90143903. The next prime is 90143929. The reversal of 90143904 is 40934109.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×90143904² = 16251846856722432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90143903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132814 + ... + 133490.

It is an arithmetic number, because the mean of its divisors is an integer number (2634030).

Almost surely, 2^90143904 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 90143904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126433440).

90143904 is an abundant number, since it is smaller than the sum of its proper divisors (162722976).

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

90143904 is a wasteful number, since it uses less digits than its factorization.

90143904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782 (or 774 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 90143904 is about 9494.4143579265. The cubic root of 90143904 is about 448.3791963818.

The spelling of 90143904 in words is "ninety million, one hundred forty-three thousand, nine hundred four".