255988740 has 72 divisors (see below), whose sum is σ = 833801472. Its totient is φ = 58511040.

The previous prime is 255988721. The next prime is 255988751. The reversal of 255988740 is 47889552.

It is a self number, because there is not a number n which added to its sum of digits gives 255988740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40596 + ... + 46475.

It is an arithmetic number, because the mean of its divisors is an integer number (11580576).

Almost surely, 2^255988740 is an apocalyptic number.

255988740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255988740 is an abundant number, since it is smaller than the sum of its proper divisors (577812732).

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

255988740 is a wasteful number, since it uses less digits than its factorization.

255988740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87097 (or 87088 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 48.

The square root of 255988740 is about 15999.6481211307. The cubic root of 255988740 is about 634.9511112050.

The spelling of 255988740 in words is "two hundred fifty-five million, nine hundred eighty-eight thousand, seven hundred forty".