90389636 has 12 divisors (see below), whose sum is σ = 163636620. Its totient is φ = 43636320.

The previous prime is 90389627. The next prime is 90389639. The reversal of 90389636 is 63698309.

It can be written as a sum of positive squares in 2 ways, for example, as 48916036 + 41473600 = 6994^2 + 6440^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (90389639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389495 + ... + 389726.

It is an arithmetic number, because the mean of its divisors is an integer number (13636385).

Almost surely, 2^90389636 is an apocalyptic number.

It is an amenable number.

90389636 is a deficient number, since it is larger than the sum of its proper divisors (73246984).

90389636 is a wasteful number, since it uses less digits than its factorization.

90389636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779254 (or 779252 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 90389636 is about 9507.3464226355. The cubic root of 90389636 is about 448.7862534885.

The spelling of 90389636 in words is "ninety million, three hundred eighty-nine thousand, six hundred thirty-six".