27868021 has 4 divisors (see below), whose sum is σ = 28144044. Its totient is φ = 27592000.

The previous prime is 27868013. The next prime is 27868031. The reversal of 27868021 is 12086872.

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 23415921 + 4452100 = 4839^2 + 2110^2 .

It is a cyclic number.

It is not a de Polignac number, because 27868021 - 2³ = 27868013 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 (27868031) 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, 137860 + ... + 138061.

It is an arithmetic number, because the mean of its divisors is an integer number (7036011).

Almost surely, 2^27868021 is an apocalyptic number.

It is an amenable number.

27868021 is a deficient number, since it is larger than the sum of its proper divisors (276023).

27868021 is a wasteful number, since it uses less digits than its factorization.

27868021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276022.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 27868021 is about 5279.0170486559. The cubic root of 27868021 is about 303.1810432531.

The spelling of 27868021 in words is "twenty-seven million, eight hundred sixty-eight thousand, twenty-one".