255791868 has 12 divisors (see below), whose sum is σ = 596847720. Its totient is φ = 85263952.

The previous prime is 255791839. The next prime is 255791869. The reversal of 255791868 is 868197552.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 255791868.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255791869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10657983 + ... + 10658006.

It is an arithmetic number, because the mean of its divisors is an integer number (49737310).

Almost surely, 2^255791868 is an apocalyptic number.

It is an amenable number.

255791868 is an abundant number, since it is smaller than the sum of its proper divisors (341055852).

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

255791868 is a wasteful number, since it uses less digits than its factorization.

255791868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21315996 (or 21315994 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 51.

The square root of 255791868 is about 15993.4945524735. The cubic root of 255791868 is about 634.7882965512.

The spelling of 255791868 in words is "two hundred fifty-five million, seven hundred ninety-one thousand, eight hundred sixty-eight".