256169256 has 96 divisors (see below), whose sum is σ = 757406880. Its totient is φ = 71971200.

The previous prime is 256169237. The next prime is 256169261. The reversal of 256169256 is 652961652.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69951 + ... + 73521.

It is an arithmetic number, because the mean of its divisors is an integer number (7889655).

Almost surely, 2^256169256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256169256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378703440).

256169256 is an abundant number, since it is smaller than the sum of its proper divisors (501237624).

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

256169256 is a wasteful number, since it uses less digits than its factorization.

256169256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655 (or 3644 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 256169256 is about 16005.2883760337. The cubic root of 256169256 is about 635.1003259756.

It can be divided in two parts, 2561 and 69256, that added together give a palindrome (71817).

The spelling of 256169256 in words is "two hundred fifty-six million, one hundred sixty-nine thousand, two hundred fifty-six".