90199128 has 16 divisors (see below), whose sum is σ = 225497880. Its totient is φ = 30066368.

The previous prime is 90199121. The next prime is 90199159. The reversal of 90199128 is 82199109.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90199121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1879125 + ... + 1879172.

Almost surely, 2^90199128 is an apocalyptic number.

It is an amenable number.

90199128 is an abundant number, since it is smaller than the sum of its proper divisors (135298752).

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

90199128 is a wasteful number, since it uses less digits than its factorization.

90199128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3758306 (or 3758302 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 90199128 is about 9497.3221489007. The cubic root of 90199128 is about 448.4707397805.

The spelling of 90199128 in words is "ninety million, one hundred ninety-nine thousand, one hundred twenty-eight".