255855864 has 128 divisors (see below), whose sum is σ = 753753600. Its totient is φ = 71554560.

The previous prime is 255855829. The next prime is 255855869. The reversal of 255855864 is 468558552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255855869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175362 + ... + 176814.

It is an arithmetic number, because the mean of its divisors is an integer number (5888700).

Almost surely, 2^255855864 is an apocalyptic number.

255855864 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 255855864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (376876800).

255855864 is an abundant number, since it is smaller than the sum of its proper divisors (497897736).

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

255855864 is a wasteful number, since it uses less digits than its factorization.

255855864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525 (or 1521 counting only the distinct ones).

The product of its digits is 1920000, while the sum is 48.

The square root of 255855864 is about 15995.4951158131. The cubic root of 255855864 is about 634.8412308955.

The spelling of 255855864 in words is "two hundred fifty-five million, eight hundred fifty-five thousand, eight hundred sixty-four".