90128910 has 32 divisors (see below), whose sum is σ = 216577152. Its totient is φ = 24004640.

The previous prime is 90128893. The next prime is 90128911. The reversal of 90128910 is 1982109.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90128911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34345 + ... + 36875.

It is an arithmetic number, because the mean of its divisors is an integer number (6768036).

Almost surely, 2^90128910 is an apocalyptic number.

90128910 is an abundant number, since it is smaller than the sum of its proper divisors (126448242).

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

90128910 is a wasteful number, since it uses less digits than its factorization.

90128910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3728.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 90128910 is about 9493.6247029256. The cubic root of 90128910 is about 448.3543347618.

The spelling of 90128910 in words is "ninety million, one hundred twenty-eight thousand, nine hundred ten".