256305740 has 24 divisors (see below), whose sum is σ = 545825952. Its totient is φ = 101077760.

The previous prime is 256305733. The next prime is 256305793. The reversal of 256305740 is 47503652.

It is a junction number, because it is equal to n+sod(n) for n = 256305697 and 256305706.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88829 + ... + 91668.

It is an arithmetic number, because the mean of its divisors is an integer number (22742748).

Almost surely, 2^256305740 is an apocalyptic number.

256305740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256305740 is an abundant number, since it is smaller than the sum of its proper divisors (289520212).

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

256305740 is a wasteful number, since it uses less digits than its factorization.

256305740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180577 (or 180575 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 256305740 is about 16009.5515240122. The cubic root of 256305740 is about 635.2130973058.

The spelling of 256305740 in words is "two hundred fifty-six million, three hundred five thousand, seven hundred forty".