90638068 has 12 divisors (see below), whose sum is σ = 158747652. Its totient is φ = 45281600.

The previous prime is 90638063. The next prime is 90638071. The reversal of 90638068 is 86083609.

It can be written as a sum of positive squares in 2 ways, for example, as 36144144 + 54493924 = 6012^2 + 7382^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 90638068.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90638063) 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, 3505 + ... + 13912.

It is an arithmetic number, because the mean of its divisors is an integer number (13228971).

Almost surely, 2^90638068 is an apocalyptic number.

It is an amenable number.

90638068 is a deficient number, since it is larger than the sum of its proper divisors (68109584).

90638068 is a wasteful number, since it uses less digits than its factorization.

90638068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18722 (or 18720 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 90638068 is about 9520.4027225743. The cubic root of 90638068 is about 449.1970339080.

The spelling of 90638068 in words is "ninety million, six hundred thirty-eight thousand, sixty-eight".