255731820 has 24 divisors (see below), whose sum is σ = 716049264. Its totient is φ = 68195136.

The previous prime is 255731813. The next prime is 255731821. The reversal of 255731820 is 28137552.

It is not an unprimeable number, because it can be changed into a prime (255731821) 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, 2131039 + ... + 2131158.

It is an arithmetic number, because the mean of its divisors is an integer number (29835386).

Almost surely, 2^255731820 is an apocalyptic number.

255731820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255731820 is an abundant number, since it is smaller than the sum of its proper divisors (460317444).

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

255731820 is a wasteful number, since it uses less digits than its factorization.

255731820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262209 (or 4262207 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 255731820 is about 15991.6171790098. The cubic root of 255731820 is about 634.7386197689.

The spelling of 255731820 in words is "two hundred fifty-five million, seven hundred thirty-one thousand, eight hundred twenty".