255647820 has 48 divisors (see below), whose sum is σ = 718125408. Its totient is φ = 67952640.

The previous prime is 255647761. The next prime is 255647879. The reversal of 255647820 is 28746552.

255647820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (255647761) and next prime (255647879).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12300 + ... + 25740.

It is an arithmetic number, because the mean of its divisors is an integer number (14960946).

Almost surely, 2^255647820 is an apocalyptic number.

255647820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255647820 is an abundant number, since it is smaller than the sum of its proper divisors (462477588).

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

255647820 is a wasteful number, since it uses less digits than its factorization.

255647820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13770 (or 13768 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 39.

The square root of 255647820 is about 15988.9905872760. The cubic root of 255647820 is about 634.6691148179.

The spelling of 255647820 in words is "two hundred fifty-five million, six hundred forty-seven thousand, eight hundred twenty".