255663864 has 80 divisors (see below), whose sum is σ = 733637520. Its totient is φ = 83134080.

The previous prime is 255663841. The next prime is 255663887. The reversal of 255663864 is 468366552.

255663864 is a `hidden beast` number, since 2 + 5 + 5 + 6 + 638 + 6 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (255663841) and next prime (255663887).

It is a super-2 number, since 2×255663864² = 130728022710820992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21757 + ... + 31379.

It is an arithmetic number, because the mean of its divisors is an integer number (9170469).

Almost surely, 2^255663864 is an apocalyptic number.

255663864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255663864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (366818760).

255663864 is an abundant number, since it is smaller than the sum of its proper divisors (477973656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255663864 is a wasteful number, since it uses less digits than its factorization.

255663864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9682 (or 9669 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The square root of 255663864 is about 15989.4922996323. The cubic root of 255663864 is about 634.6823914397.

The spelling of 255663864 in words is "two hundred fifty-five million, six hundred sixty-three thousand, eight hundred sixty-four".