90638686 has 8 divisors (see below), whose sum is σ = 136266264. Its totient is φ = 45216600.

The previous prime is 90638677. The next prime is 90638687. The reversal of 90638686 is 68683609.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90638687) 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, 50265 + ... + 52036.

It is an arithmetic number, because the mean of its divisors is an integer number (17033283).

Almost surely, 2^90638686 is an apocalyptic number.

90638686 is a deficient number, since it is larger than the sum of its proper divisors (45627578).

90638686 is a wasteful number, since it uses less digits than its factorization.

90638686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102746.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 90638686 is about 9520.4351791292. The cubic root of 90638686 is about 449.1980548297.

The spelling of 90638686 in words is "ninety million, six hundred thirty-eight thousand, six hundred eighty-six".