27979867 has 4 divisors (see below), whose sum is σ = 28944720. Its totient is φ = 27015016.

The previous prime is 27979829. The next prime is 27979871. The reversal of 27979867 is 76897972.

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 27979867 - 2¹¹ = 27977819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27979877) 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, 482383 + ... + 482440.

It is an arithmetic number, because the mean of its divisors is an integer number (7236180).

Almost surely, 2^27979867 is an apocalyptic number.

27979867 is a deficient number, since it is larger than the sum of its proper divisors (964853).

27979867 is an equidigital number, since it uses as much as digits as its factorization.

27979867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964852.

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

The square root of 27979867 is about 5289.5998903509. The cubic root of 27979867 is about 303.5860992060.

The spelling of 27979867 in words is "twenty-seven million, nine hundred seventy-nine thousand, eight hundred sixty-seven".