27981279 has 6 divisors (see below), whose sum is σ = 40417416. Its totient is φ = 18654180.

The previous prime is 27981263. The next prime is 27981293. The reversal of 27981279 is 97218972.

It is not a de Polignac number, because 27981279 - 2⁴ = 27981263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27981979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1554507 + ... + 1554524.

It is an arithmetic number, because the mean of its divisors is an integer number (6736236).

Almost surely, 2^27981279 is an apocalyptic number.

27981279 is a deficient number, since it is larger than the sum of its proper divisors (12436137).

27981279 is a wasteful number, since it uses less digits than its factorization.

27981279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109037 (or 3109034 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 27981279 is about 5289.7333581193. The cubic root of 27981279 is about 303.5912059298.

The spelling of 27981279 in words is "twenty-seven million, nine hundred eighty-one thousand, two hundred seventy-nine".