27978967 has 2 divisors, whose sum is σ = 27978968. Its totient is φ = 27978966.

The previous prime is 27978943. The next prime is 27978983. The reversal of 27978967 is 76987972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27978967 - 2¹¹ = 27976919 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27978367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13989483 + 13989484.

It is an arithmetic number, because the mean of its divisors is an integer number (13989484).

Almost surely, 2^27978967 is an apocalyptic number.

27978967 is a deficient number, since it is larger than the sum of its proper divisors (1).

27978967 is an equidigital number, since it uses as much as digits as its factorization.

27978967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2667168, while the sum is 55.

The square root of 27978967 is about 5289.5148170697. The cubic root of 27978967 is about 303.5828441224.

The spelling of 27978967 in words is "twenty-seven million, nine hundred seventy-eight thousand, nine hundred sixty-seven".