27890131 has 4 divisors (see below), whose sum is σ = 27938232. Its totient is φ = 27842032.

The previous prime is 27890123. The next prime is 27890143. The reversal of 27890131 is 13109872.

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

It is a cyclic number.

It is not a de Polignac number, because 27890131 - 2³ = 27890123 is a prime.

It is a super-2 number, since 2×27890131² = 1555718814394322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27890093 and 27890102.

It is not an unprimeable number, because it can be changed into a prime (27894131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23170 + ... + 24343.

It is an arithmetic number, because the mean of its divisors is an integer number (6984558).

Almost surely, 2^27890131 is an apocalyptic number.

27890131 is a deficient number, since it is larger than the sum of its proper divisors (48101).

27890131 is an equidigital number, since it uses as much as digits as its factorization.

27890131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48100.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 27890131 is about 5281.1107733128. The cubic root of 27890131 is about 303.2612015689.

It can be divided in two parts, 278 and 90131, that added together give a palindrome (90409).

The spelling of 27890131 in words is "twenty-seven million, eight hundred ninety thousand, one hundred thirty-one".