255654640 has 20 divisors (see below), whose sum is σ = 594397224. Its totient is φ = 102261824.

The previous prime is 255654617. The next prime is 255654661. The reversal of 255654640 is 46456552.

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

It is a self number, because there is not a number n which added to its sum of digits gives 255654640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1597762 + ... + 1597921.

Almost surely, 2^255654640 is an apocalyptic number.

255654640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255654640 is an abundant number, since it is smaller than the sum of its proper divisors (338742584).

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

255654640 is a wasteful number, since it uses less digits than its factorization.

255654640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3195696 (or 3195690 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 255654640 is about 15989.2038576034. The cubic root of 255654640 is about 634.6747585258.

The spelling of 255654640 in words is "two hundred fifty-five million, six hundred fifty-four thousand, six hundred forty".