27979799 has 16 divisors (see below), whose sum is σ = 31468800. Its totient is φ = 24748416.

The previous prime is 27979771. The next prime is 27979823. The reversal of 27979799 is 99797972.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27979799 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 (27979729) 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 15 ways as a sum of consecutive naturals, for example, 18047 + ... + 19535.

It is an arithmetic number, because the mean of its divisors is an integer number (1966800).

Almost surely, 2^27979799 is an apocalyptic number.

27979799 is a deficient number, since it is larger than the sum of its proper divisors (3489001).

27979799 is a wasteful number, since it uses less digits than its factorization.

27979799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574.

The product of its digits is 4500846, while the sum is 59.

The square root of 27979799 is about 5289.5934626396. The cubic root of 27979799 is about 303.5858532688.

The spelling of 27979799 in words is "twenty-seven million, nine hundred seventy-nine thousand, seven hundred ninety-nine".