26857 has 4 divisors (see below), whose sum is σ = 27216. Its totient is φ = 26500.

The previous prime is 26849. The next prime is 26861. The reversal of 26857 is 75862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 26857 - 2³ = 26849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26357) 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, 19 + ... + 232.

It is an arithmetic number, because the mean of its divisors is an integer number (6804).

2²⁶⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

26857 is a deficient number, since it is larger than the sum of its proper divisors (359).

26857 is a wasteful number, since it uses less digits than its factorization.

26857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358.

The product of its digits is 3360, while the sum is 28.

The square root of 26857 is about 163.8810544267. The cubic root of 26857 is about 29.9469432584.

It can be divided in two parts, 268 and 57, that added together give a triangular number (325 = T₂₅).

The spelling of 26857 in words is "twenty-six thousand, eight hundred fifty-seven".