255257840 has 20 divisors (see below), whose sum is σ = 593474664. Its totient is φ = 102103104.

The previous prime is 255257833. The next prime is 255257843. The reversal of 255257840 is 48752552.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 255257794 and 255257803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255257843) 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 3 ways as a sum of consecutive naturals, for example, 1595282 + ... + 1595441.

Almost surely, 2^255257840 is an apocalyptic number.

255257840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255257840 is an abundant number, since it is smaller than the sum of its proper divisors (338216824).

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

255257840 is a wasteful number, since it uses less digits than its factorization.

255257840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3190736 (or 3190730 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 38.

The square root of 255257840 is about 15976.7906664636. The cubic root of 255257840 is about 634.3462302305.

The spelling of 255257840 in words is "two hundred fifty-five million, two hundred fifty-seven thousand, eight hundred forty".