90639444 has 48 divisors (see below), whose sum is σ = 255927168. Its totient is φ = 24373248.

The previous prime is 90639433. The next prime is 90639449. The reversal of 90639444 is 44493609.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90639449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30309 + ... + 33164.

It is an arithmetic number, because the mean of its divisors is an integer number (5331816).

Almost surely, 2^90639444 is an apocalyptic number.

It is an amenable number.

90639444 is an abundant number, since it is smaller than the sum of its proper divisors (165287724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90639444 is a wasteful number, since it uses less digits than its factorization.

90639444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63504 (or 63502 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 90639444 is about 9520.4749881505. The cubic root of 90639444 is about 449.1993070220.

The spelling of 90639444 in words is "ninety million, six hundred thirty-nine thousand, four hundred forty-four".