27992617 has 4 divisors (see below), whose sum is σ = 28249540. Its totient is φ = 27735696.

The previous prime is 27992599. The next prime is 27992641. The reversal of 27992617 is 71629972.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7958041 + 20034576 = 2821^2 + 4476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27992617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27992117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128298 + ... + 128515.

It is an arithmetic number, because the mean of its divisors is an integer number (7062385).

Almost surely, 2^27992617 is an apocalyptic number.

It is an amenable number.

27992617 is a deficient number, since it is larger than the sum of its proper divisors (256923).

27992617 is a wasteful number, since it uses less digits than its factorization.

27992617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256922.

The product of its digits is 95256, while the sum is 43.

The square root of 27992617 is about 5290.8049482097. The cubic root of 27992617 is about 303.6322053933.

The spelling of 27992617 in words is "twenty-seven million, nine hundred ninety-two thousand, six hundred seventeen".