256443215 has 48 divisors (see below), whose sum is σ = 395658432. Its totient is φ = 158247936.

The previous prime is 256443157. The next prime is 256443221. The reversal of 256443215 is 512344652.

256443215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256443215 - 2⁸ = 256442959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 94457 + ... + 97133.

It is an arithmetic number, because the mean of its divisors is an integer number (8242884).

Almost surely, 2^256443215 is an apocalyptic number.

256443215 is a deficient number, since it is larger than the sum of its proper divisors (139215217).

256443215 is a wasteful number, since it uses less digits than its factorization.

256443215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2736 (or 2729 counting only the distinct ones).

The product of its digits is 28800, while the sum is 32.

The square root of 256443215 is about 16013.8444790750. The cubic root of 256443215 is about 635.3266469961.

Adding to 256443215 its reverse (512344652), we get a palindrome (768787867).

The spelling of 256443215 in words is "two hundred fifty-six million, four hundred forty-three thousand, two hundred fifteen".