27992857 has 4 divisors (see below), whose sum is σ = 28270116. Its totient is φ = 27715600.

The previous prime is 27992849. The next prime is 27992879. The reversal of 27992857 is 75829972.

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 21123216 + 6869641 = 4596^2 + 2621^2 .

It is a cyclic number.

It is not a de Polignac number, because 27992857 - 2³ = 27992849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27992857.

It is not an unprimeable number, because it can be changed into a prime (27999857) 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, 138478 + ... + 138679.

It is an arithmetic number, because the mean of its divisors is an integer number (7067529).

Almost surely, 2^27992857 is an apocalyptic number.

It is an amenable number.

27992857 is a deficient number, since it is larger than the sum of its proper divisors (277259).

27992857 is a wasteful number, since it uses less digits than its factorization.

27992857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277258.

The product of its digits is 635040, while the sum is 49.

The square root of 27992857 is about 5290.8276290199. The cubic root of 27992857 is about 303.6330731403.

The spelling of 27992857 in words is "twenty-seven million, nine hundred ninety-two thousand, eight hundred fifty-seven".