256045 has 8 divisors (see below), whose sum is σ = 315000. Its totient is φ = 199680.

The previous prime is 256033. The next prime is 256049. The reversal of 256045 is 540652.

It can be written as a sum of positive squares in 4 ways, for example, as 9 + 256036 = 3^2 + 506^2 .

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

It is not a de Polignac number, because 256045 - 2⁷ = 255917 is a prime.

256045 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256049) 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, 420 + ... + 829.

It is an arithmetic number, because the mean of its divisors is an integer number (39375).

256045 is a Friedman number, since it can be written as 506^2+5+4, using all its digits and the basic arithmetic operations.

2²⁵⁶⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

256045 is a deficient number, since it is larger than the sum of its proper divisors (58955).

256045 is a wasteful number, since it uses less digits than its factorization.

256045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 256045 is about 506.0088932025. The cubic root of 256045 is about 63.4997623320.

Adding to 256045 its reverse (540652), we get a palindrome (796697).

The spelling of 256045 in words is "two hundred fifty-six thousand, forty-five".