27999967 has 4 divisors (see below), whose sum is σ = 28337400. Its totient is φ = 27662536.

The previous prime is 27999943. The next prime is 28000019. The reversal of 27999967 is 76999972.

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 27999967 - 2²³ = 19611359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27999467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168592 + ... + 168757.

It is an arithmetic number, because the mean of its divisors is an integer number (7084350).

Almost surely, 2^27999967 is an apocalyptic number.

27999967 is a deficient number, since it is larger than the sum of its proper divisors (337433).

27999967 is an equidigital number, since it uses as much as digits as its factorization.

27999967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337432.

The product of its digits is 3857868, while the sum is 58.

The square root of 27999967 is about 5291.4995039214. The cubic root of 27999967 is about 303.6587778930.

The spelling of 27999967 in words is "twenty-seven million, nine hundred ninety-nine thousand, nine hundred sixty-seven".