27979927 has 4 divisors (see below), whose sum is σ = 28079080. Its totient is φ = 27880776.

The previous prime is 27979901. The next prime is 27979933. The reversal of 27979927 is 72997972.

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 27979927 - 2¹⁵ = 27947159 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 (27979957) 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, 49152 + ... + 49717.

It is an arithmetic number, because the mean of its divisors is an integer number (7019770).

Almost surely, 2^27979927 is an apocalyptic number.

27979927 is a deficient number, since it is larger than the sum of its proper divisors (99153).

27979927 is an equidigital number, since it uses as much as digits as its factorization.

27979927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99152.

The product of its digits is 1000188, while the sum is 52.

The square root of 27979927 is about 5289.6055618543. The cubic root of 27979927 is about 303.5863162091.

The spelling of 27979927 in words is "twenty-seven million, nine hundred seventy-nine thousand, nine hundred twenty-seven".