256330 has 8 divisors (see below), whose sum is σ = 461412. Its totient is φ = 102528.

The previous prime is 256313. The next prime is 256337. The reversal of 256330 is 33652.

256330 = T₁₅₀ + T₁₅₁ + ... + T₁₆₉.

It can be written as a sum of positive squares in 2 ways, for example, as 251001 + 5329 = 501^2 + 73^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 256298 and 256307.

It is not an unprimeable number, because it can be changed into a prime (256337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12807 + ... + 12826.

2²⁵⁶³³⁰ is an apocalyptic number.

256330 is a deficient number, since it is larger than the sum of its proper divisors (205082).

256330 is a wasteful number, since it uses less digits than its factorization.

256330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25640.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 256330 is about 506.2904304843. The cubic root of 256330 is about 63.5233138193.

Adding to 256330 its reverse (33652), we get a palindrome (289982).

The spelling of 256330 in words is "two hundred fifty-six thousand, three hundred thirty".