90644375 has 10 divisors (see below), whose sum is σ = 113269992. Its totient is φ = 72515000.

The previous prime is 90644327. The next prime is 90644377. The reversal of 90644375 is 57344609.

It is not a de Polignac number, because 90644375 - 2¹⁰ = 90643351 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 (90644377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 71891 + ... + 73140.

Almost surely, 2^90644375 is an apocalyptic number.

90644375 is a deficient number, since it is larger than the sum of its proper divisors (22625617).

90644375 is an equidigital number, since it uses as much as digits as its factorization.

90644375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145051 (or 145036 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 90644375 is about 9520.7339528001. The cubic root of 90644375 is about 449.2074527090.

It can be divided in two parts, 90644 and 375, that added together give a palindrome (91019).

The spelling of 90644375 in words is "ninety million, six hundred forty-four thousand, three hundred seventy-five".