27891667 has 2 divisors, whose sum is σ = 27891668. Its totient is φ = 27891666.

The previous prime is 27891629. The next prime is 27891697. The reversal of 27891667 is 76619872.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27891667 - 2¹⁵ = 27858899 is a prime.

It is not a weakly prime, because it can be changed into another prime (27891607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13945833 + 13945834.

It is an arithmetic number, because the mean of its divisors is an integer number (13945834).

Almost surely, 2^27891667 is an apocalyptic number.

27891667 is a deficient number, since it is larger than the sum of its proper divisors (1).

27891667 is an equidigital number, since it uses as much as digits as its factorization.

27891667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 27891667 is about 5281.2561952626. The cubic root of 27891667 is about 303.2667686594.

The spelling of 27891667 in words is "twenty-seven million, eight hundred ninety-one thousand, six hundred sixty-seven".