857564 has 6 divisors (see below), whose sum is σ = 1500744. Its totient is φ = 428780.

The previous prime is 857551. The next prime is 857567. The reversal of 857564 is 465758.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857567) by changing a digit.

857564 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 107192 + ... + 107199.

It is an arithmetic number, because the mean of its divisors is an integer number (250124).

2⁸⁵⁷⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

857564 is a deficient number, since it is larger than the sum of its proper divisors (643180).

857564 is a wasteful number, since it uses less digits than its factorization.

857564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214395 (or 214393 counting only the distinct ones).

The product of its digits is 33600, while the sum is 35.

The square root of 857564 is about 926.0475149797. The cubic root of 857564 is about 95.0069800965.

The spelling of 857564 in words is "eight hundred fifty-seven thousand, five hundred sixty-four".