27988931 has 2 divisors, whose sum is σ = 27988932. Its totient is φ = 27988930.

The previous prime is 27988927. The next prime is 27988943. The reversal of 27988931 is 13988972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27988931 - 2² = 27988927 is a prime.

It is a super-2 number, since 2×27988931² = 1566760517045522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27988921) 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 as a sum of consecutive naturals, namely, 13994465 + 13994466.

It is an arithmetic number, because the mean of its divisors is an integer number (13994466).

Almost surely, 2^27988931 is an apocalyptic number.

27988931 is a deficient number, since it is larger than the sum of its proper divisors (1).

27988931 is an equidigital number, since it uses as much as digits as its factorization.

27988931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 27988931 is about 5290.4565965519. The cubic root of 27988931 is about 303.6188776239.

The spelling of 27988931 in words is "twenty-seven million, nine hundred eighty-eight thousand, nine hundred thirty-one".