90128901 has 8 divisors (see below), whose sum is σ = 120517600. Its totient is φ = 59913072.

The previous prime is 90128893. The next prime is 90128911. The reversal of 90128901 is 10982109.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90128901 - 2³ = 90128893 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41995 + ... + 44088.

It is an arithmetic number, because the mean of its divisors is an integer number (15064700).

Almost surely, 2^90128901 is an apocalyptic number.

It is an amenable number.

90128901 is a deficient number, since it is larger than the sum of its proper divisors (30388699).

90128901 is a wasteful number, since it uses less digits than its factorization.

90128901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86435.

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

The square root of 90128901 is about 9493.6242289233. The cubic root of 90128901 is about 448.3543198381.

The spelling of 90128901 in words is "ninety million, one hundred twenty-eight thousand, nine hundred one".