27699979 has 4 divisors (see below), whose sum is σ = 27713880. Its totient is φ = 27686080.

The previous prime is 27699977. The next prime is 27700003. The reversal of 27699979 is 97999672.

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 27699979 - 2¹ = 27699977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27699977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3334 + ... + 8155.

It is an arithmetic number, because the mean of its divisors is an integer number (6928470).

Almost surely, 2^27699979 is an apocalyptic number.

27699979 is a deficient number, since it is larger than the sum of its proper divisors (13901).

27699979 is a wasteful number, since it uses less digits than its factorization.

27699979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13900.

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

The square root of 27699979 is about 5263.0769517460. The cubic root of 27699979 is about 302.5704282433.

The spelling of 27699979 in words is "twenty-seven million, six hundred ninety-nine thousand, nine hundred seventy-nine".