256261826 has 4 divisors (see below), whose sum is σ = 384392742. Its totient is φ = 128130912.

The previous prime is 256261799. The next prime is 256261829. The reversal of 256261826 is 628162652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 246333025 + 9928801 = 15695^2 + 3151^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 256261826.

It is not an unprimeable number, because it can be changed into a prime (256261829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64065455 + ... + 64065458.

Almost surely, 2^256261826 is an apocalyptic number.

256261826 is a deficient number, since it is larger than the sum of its proper divisors (128130916).

256261826 is a wasteful number, since it uses less digits than its factorization.

256261826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128130915.

The product of its digits is 69120, while the sum is 38.

The square root of 256261826 is about 16008.1799715021. The cubic root of 256261826 is about 635.1768172740.

The spelling of 256261826 in words is "two hundred fifty-six million, two hundred sixty-one thousand, eight hundred twenty-six".