855664 has 10 divisors (see below), whose sum is σ = 1657880. Its totient is φ = 427824.

The previous prime is 855641. The next prime is 855667. The reversal of 855664 is 466558.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26724 + ... + 26755.

It is an arithmetic number, because the mean of its divisors is an integer number (165788).

2⁸⁵⁵⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

855664 is a deficient number, since it is larger than the sum of its proper divisors (802216).

855664 is a wasteful number, since it uses less digits than its factorization.

855664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53487 (or 53481 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The square root of 855664 is about 925.0210808409. The cubic root of 855664 is about 94.9367630864.

The spelling of 855664 in words is "eight hundred fifty-five thousand, six hundred sixty-four".