90128790 has 24 divisors (see below), whose sum is σ = 234335088. Its totient is φ = 24034320.

The previous prime is 90128771. The next prime is 90128791. The reversal of 90128790 is 9782109.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90128791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 500626 + ... + 500805.

It is an arithmetic number, because the mean of its divisors is an integer number (9763962).

Almost surely, 2^90128790 is an apocalyptic number.

90128790 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

90128790 is an abundant number, since it is smaller than the sum of its proper divisors (144206298).

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

90128790 is a wasteful number, since it uses less digits than its factorization.

90128790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001444 (or 1001441 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 90128790 is about 9493.6183828928. The cubic root of 90128790 is about 448.3541357782.

The spelling of 90128790 in words is "ninety million, one hundred twenty-eight thousand, seven hundred ninety".