256715216 has 20 divisors (see below), whose sum is σ = 513431424. Its totient is φ = 124216800.

The previous prime is 256715209. The next prime is 256715233. The reversal of 256715216 is 612517652.

256715216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

256715216 is an admirable number.

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, 258290 + ... + 259281.

Almost surely, 2^256715216 is an apocalyptic number.

It is an amenable number.

256715216 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256715216 is a wasteful number, since it uses less digits than its factorization.

256715216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517610 (or 517604 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The square root of 256715216 is about 16022.3349109922. The cubic root of 256715216 is about 635.5511910814.

The spelling of 256715216 in words is "two hundred fifty-six million, seven hundred fifteen thousand, two hundred sixteen".