90631018 has 4 divisors (see below), whose sum is σ = 135946530. Its totient is φ = 45315508.

The previous prime is 90631001. The next prime is 90631027. The reversal of 90631018 is 81013609.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 82319329 + 8311689 = 9073^2 + 2883^2 .

It is a super-3 number, since 3×90631018³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22657753 + ... + 22657756.

Almost surely, 2^90631018 is an apocalyptic number.

90631018 is a deficient number, since it is larger than the sum of its proper divisors (45315512).

90631018 is a wasteful number, since it uses less digits than its factorization.

90631018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45315511.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 90631018 is about 9520.0324579279. The cubic root of 90631018 is about 449.1853871416.

The spelling of 90631018 in words is "ninety million, six hundred thirty-one thousand, eighteen".