256630 has 16 divisors (see below), whose sum is σ = 504144. Its totient is φ = 93280.

The previous prime is 256609. The next prime is 256639. The reversal of 256630 is 36652.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1057 + ... + 1276.

It is an arithmetic number, because the mean of its divisors is an integer number (31509).

2²⁵⁶⁶³⁰ is an apocalyptic number.

256630 is a deficient number, since it is larger than the sum of its proper divisors (247514).

256630 is a wasteful number, since it uses less digits than its factorization.

256630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 256630 is about 506.5866164833. The cubic root of 256630 is about 63.5480860068.

Adding to 256630 its sum of digits (22), we get a palindrome (256652).

The spelling of 256630 in words is "two hundred fifty-six thousand, six hundred thirty".