256515530 has 32 divisors (see below), whose sum is σ = 473570496. Its totient is φ = 100007424.

The previous prime is 256515509. The next prime is 256515541. The reversal of 256515530 is 35515652.

256515530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63017 + ... + 66963.

It is an arithmetic number, because the mean of its divisors is an integer number (14799078).

Almost surely, 2^256515530 is an apocalyptic number.

256515530 is a deficient number, since it is larger than the sum of its proper divisors (217054966).

256515530 is a wasteful number, since it uses less digits than its factorization.

256515530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4118.

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 256515530 is about 16016.1022099636. The cubic root of 256515530 is about 635.3863604477.

The spelling of 256515530 in words is "two hundred fifty-six million, five hundred fifteen thousand, five hundred thirty".