255999644 has 24 divisors (see below), whose sum is σ = 452266080. Its totient is φ = 126786816.

The previous prime is 255999641. The next prime is 255999649. The reversal of 255999644 is 446999552.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255999641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272744 + ... + 273680.

It is an arithmetic number, because the mean of its divisors is an integer number (18844420).

Almost surely, 2^255999644 is an apocalyptic number.

It is an amenable number.

255999644 is a deficient number, since it is larger than the sum of its proper divisors (196266436).

255999644 is a wasteful number, since it uses less digits than its factorization.

255999644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517 (or 1515 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 53.

The square root of 255999644 is about 15999.9888749961. The cubic root of 255999644 is about 634.9601264565.

The spelling of 255999644 in words is "two hundred fifty-five million, nine hundred ninety-nine thousand, six hundred forty-four".