255717720 has 48 divisors (see below), whose sum is σ = 831083760. Its totient is φ = 68191296.

The previous prime is 255717677. The next prime is 255717727. The reversal of 255717720 is 27717552.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255717727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 354804 + ... + 355523.

It is an arithmetic number, because the mean of its divisors is an integer number (17314245).

Almost surely, 2^255717720 is an apocalyptic number.

255717720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255717720 is an abundant number, since it is smaller than the sum of its proper divisors (575366040).

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

255717720 is a wasteful number, since it uses less digits than its factorization.

255717720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710344 (or 710337 counting only the distinct ones).

The product of its (nonzero) digits is 34300, while the sum is 36.

The square root of 255717720 is about 15991.1763169568. The cubic root of 255717720 is about 634.7269539295.

The spelling of 255717720 in words is "two hundred fifty-five million, seven hundred seventeen thousand, seven hundred twenty".