90921875 has 42 divisors (see below), whose sum is σ = 129607716. Its totient is φ = 63250000.

The previous prime is 90921869. The next prime is 90921877. The reversal of 90921875 is 57812909.

It is not a de Polignac number, because 90921875 - 2⁸ = 90921619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90921877) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 3953114 + ... + 3953136.

It is an arithmetic number, because the mean of its divisors is an integer number (3085898).

Almost surely, 2^90921875 is an apocalyptic number.

90921875 is a deficient number, since it is larger than the sum of its proper divisors (38685841).

90921875 is an frugal number, since it uses more digits than its factorization.

90921875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 90921875 is about 9535.2962722718. The cubic root of 90921875 is about 449.6653891119.

The spelling of 90921875 in words is "ninety million, nine hundred twenty-one thousand, eight hundred seventy-five".