90890402 has 16 divisors (see below), whose sum is σ = 138656760. Its totient is φ = 44675712.

The previous prime is 90890383. The next prime is 90890407. The reversal of 90890402 is 20409809.

It can be written as a sum of positive squares in 4 ways, for example, as 81884401 + 9006001 = 9049^2 + 3001^2 .

It is a super-2 number, since 2×90890402² = 16522130351443208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90890407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53624 + ... + 55292.

Almost surely, 2^90890402 is an apocalyptic number.

90890402 is a deficient number, since it is larger than the sum of its proper divisors (47766358).

90890402 is a wasteful number, since it uses less digits than its factorization.

90890402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 90890402 is about 9533.6457874205. The cubic root of 90890402 is about 449.6134985847.

The spelling of 90890402 in words is "ninety million, eight hundred ninety thousand, four hundred two".