90400068 has 54 divisors (see below), whose sum is σ = 251185662. Its totient is φ = 27392640.

The previous prime is 90400021. The next prime is 90400069. The reversal of 90400068 is 86000409.

It can be written as a sum of positive squares in only one way, i.e., 70257924 + 20142144 = 8382^2 + 4488^2 .

It is not an unprimeable number, because it can be changed into a prime (90400069) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6021 + ... + 14732.

Almost surely, 2^90400068 is an apocalyptic number.

It is an amenable number.

90400068 is an abundant number, since it is smaller than the sum of its proper divisors (160785594).

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

90400068 is a wasteful number, since it uses less digits than its factorization.

90400068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20785 (or 20769 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 90400068 is about 9507.8950351800. The cubic root of 90400068 is about 448.8035178502.

The spelling of 90400068 in words is "ninety million, four hundred thousand, sixty-eight".