256285240 has 16 divisors (see below), whose sum is σ = 576641880. Its totient is φ = 102514080.

The previous prime is 256285231. The next prime is 256285327. The reversal of 256285240 is 42582652.

256285240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 256285196 and 256285205.

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, 3203526 + ... + 3203605.

Almost surely, 2^256285240 is an apocalyptic number.

256285240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256285240 is an abundant number, since it is smaller than the sum of its proper divisors (320356640).

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

256285240 is a wasteful number, since it uses less digits than its factorization.

256285240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6407142 (or 6407138 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 256285240 is about 16008.9112684155. The cubic root of 256285240 is about 635.1961615221.

The spelling of 256285240 in words is "two hundred fifty-six million, two hundred eighty-five thousand, two hundred forty".