90128811 has 24 divisors (see below), whose sum is σ = 126557184. Its totient is φ = 56989440.

The previous prime is 90128791. The next prime is 90128893. The reversal of 90128811 is 11882109.

It is not a de Polignac number, because 90128811 - 2⁷ = 90128683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90128711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 874986 + ... + 875088.

It is an arithmetic number, because the mean of its divisors is an integer number (5273216).

Almost surely, 2^90128811 is an apocalyptic number.

90128811 is a deficient number, since it is larger than the sum of its proper divisors (36428373).

90128811 is a wasteful number, since it uses less digits than its factorization.

90128811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 90128811 is about 9493.6194888988. The cubic root of 90128811 is about 448.3541706003.

The spelling of 90128811 in words is "ninety million, one hundred twenty-eight thousand, eight hundred eleven".