27690979 has 4 divisors (see below), whose sum is σ = 27798984. Its totient is φ = 27582976.

The previous prime is 27690959. The next prime is 27690997. The reversal of 27690979 is 97909672.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27690979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27690959) 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, 53617 + ... + 54130.

It is an arithmetic number, because the mean of its divisors is an integer number (6949746).

Almost surely, 2^27690979 is an apocalyptic number.

27690979 is a deficient number, since it is larger than the sum of its proper divisors (108005).

27690979 is a wasteful number, since it uses less digits than its factorization.

27690979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108004.

The product of its (nonzero) digits is 428652, while the sum is 49.

The square root of 27690979 is about 5262.2218691347. The cubic root of 27690979 is about 302.5376553084.

The spelling of 27690979 in words is "twenty-seven million, six hundred ninety thousand, nine hundred seventy-nine".