27991267 has 2 divisors, whose sum is σ = 27991268. Its totient is φ = 27991266.

The previous prime is 27991259. The next prime is 27991291. The reversal of 27991267 is 76219972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27991267 - 2³ = 27991259 is a prime.

It is a super-2 number, since 2×27991267² = 1567022056530578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27991567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13995633 + 13995634.

It is an arithmetic number, because the mean of its divisors is an integer number (13995634).

Almost surely, 2^27991267 is an apocalyptic number.

27991267 is a deficient number, since it is larger than the sum of its proper divisors (1).

27991267 is an equidigital number, since it uses as much as digits as its factorization.

27991267 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 43.

The square root of 27991267 is about 5290.6773668407. The cubic root of 27991267 is about 303.6273242245.

The spelling of 27991267 in words is "twenty-seven million, nine hundred ninety-one thousand, two hundred sixty-seven".