90975644 has 24 divisors (see below), whose sum is σ = 165281088. Its totient is φ = 43784640.

The previous prime is 90975631. The next prime is 90975671. The reversal of 90975644 is 44657909.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 90975595 and 90975604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7502 + ... + 15434.

It is an arithmetic number, because the mean of its divisors is an integer number (6886712).

Almost surely, 2^90975644 is an apocalyptic number.

90975644 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

It is an amenable number.

90975644 is a deficient number, since it is larger than the sum of its proper divisors (74305444).

90975644 is a wasteful number, since it uses less digits than its factorization.

90975644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8045 (or 8043 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 90975644 is about 9538.1153274638. The cubic root of 90975644 is about 449.7540120597.

It can be divided in two parts, 90975 and 644, that added together give a palindrome (91619).

The spelling of 90975644 in words is "ninety million, nine hundred seventy-five thousand, six hundred forty-four".