255535640 has 16 divisors (see below), whose sum is σ = 574955280. Its totient is φ = 102214240.

The previous prime is 255535613. The next prime is 255535673. The reversal of 255535640 is 46535552.

255535640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 255535640.

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, 3194156 + ... + 3194235.

It is an arithmetic number, because the mean of its divisors is an integer number (35934705).

Almost surely, 2^255535640 is an apocalyptic number.

255535640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255535640 is an abundant number, since it is smaller than the sum of its proper divisors (319419640).

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

255535640 is a wasteful number, since it uses less digits than its factorization.

255535640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6388402 (or 6388398 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 35.

The square root of 255535640 is about 15985.4821635132. The cubic root of 255535640 is about 634.5762688631.

The spelling of 255535640 in words is "two hundred fifty-five million, five hundred thirty-five thousand, six hundred forty".