27998631 has 12 divisors (see below), whose sum is σ = 40735240. Its totient is φ = 18530640.

The previous prime is 27998617. The next prime is 27998651. The reversal of 27998631 is 13689972.

27998631 is a `hidden beast` number, since 2 + 7 + 9 + 9 + 8 + 631 = 666.

It is not a de Polignac number, because 27998631 - 2⁹ = 27998119 is a prime.

It is a super-2 number, since 2×27998631² = 1567846675748322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27998651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9940 + ... + 12441.

Almost surely, 2^27998631 is an apocalyptic number.

27998631 is a deficient number, since it is larger than the sum of its proper divisors (12736609).

27998631 is a wasteful number, since it uses less digits than its factorization.

27998631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22526 (or 22523 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 27998631 is about 5291.3732622071. The cubic root of 27998631 is about 303.6539481899.

The spelling of 27998631 in words is "twenty-seven million, nine hundred ninety-eight thousand, six hundred thirty-one".