80857 has 4 divisors (see below), whose sum is σ = 92416. Its totient is φ = 69300.

The previous prime is 80849. The next prime is 80863. The reversal of 80857 is 75808.

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.

It is not a de Polignac number, because 80857 - 2³ = 80849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80897) 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, 5769 + ... + 5782.

It is an arithmetic number, because the mean of its divisors is an integer number (23104).

2⁸⁰⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

80857 is a deficient number, since it is larger than the sum of its proper divisors (11559).

80857 is a wasteful number, since it uses less digits than its factorization.

80857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11558.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 80857 is about 284.3536530449. The cubic root of 80857 is about 43.2420101739.

It can be divided in two parts, 808 and 57, that multiplied together give a triangular number (46056 = T₃₀₃).

The spelling of 80857 in words is "eighty thousand, eight hundred fifty-seven".