27899979 has 8 divisors (see below), whose sum is σ = 37830720. Its totient is φ = 18284616.

The previous prime is 27899959. The next prime is 27900011. The reversal of 27899979 is 97999872.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27899979 - 2⁸ = 27899723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27899909) 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 7 ways as a sum of consecutive naturals, for example, 78637 + ... + 78990.

It is an arithmetic number, because the mean of its divisors is an integer number (4728840).

Almost surely, 2^27899979 is an apocalyptic number.

27899979 is a deficient number, since it is larger than the sum of its proper divisors (9930741).

27899979 is a wasteful number, since it uses less digits than its factorization.

27899979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157689.

The product of its digits is 5143824, while the sum is 60.

The square root of 27899979 is about 5282.0430706309. The cubic root of 27899979 is about 303.2968911929.

The spelling of 27899979 in words is "twenty-seven million, eight hundred ninety-nine thousand, nine hundred seventy-nine".