256616 has 8 divisors (see below), whose sum is σ = 481170. Its totient is φ = 128304.

The previous prime is 256609. The next prime is 256639. The reversal of 256616 is 616652.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 119716 = 370^2 + 346^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16031 + ... + 16046.

2²⁵⁶⁶¹⁶ is an apocalyptic number.

It is an amenable number.

256616 is a deficient number, since it is larger than the sum of its proper divisors (224554).

256616 is a wasteful number, since it uses less digits than its factorization.

256616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32083 (or 32079 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 256616 is about 506.5727983222. The cubic root of 256616 is about 63.5469304009.

The spelling of 256616 in words is "two hundred fifty-six thousand, six hundred sixteen".