864255 has 16 divisors (see below), whose sum is σ = 1580544. Its totient is φ = 395040.

The previous prime is 864251. The next prime is 864277. The reversal of 864255 is 552468.

It is not a de Polignac number, because 864255 - 2² = 864251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4011 + ... + 4220.

It is an arithmetic number, because the mean of its divisors is an integer number (98784).

2⁸⁶⁴²⁵⁵ is an apocalyptic number.

864255 is a deficient number, since it is larger than the sum of its proper divisors (716289).

864255 is a wasteful number, since it uses less digits than its factorization.

864255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8246.

The product of its digits is 9600, while the sum is 30.

The square root of 864255 is about 929.6531611305. The cubic root of 864255 is about 95.2534322721.

The spelling of 864255 in words is "eight hundred sixty-four thousand, two hundred fifty-five".