256290823 has 4 divisors (see below), whose sum is σ = 263217640. Its totient is φ = 249364008.

The previous prime is 256290821. The next prime is 256290887. The reversal of 256290823 is 328092652.

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

It is a cyclic number.

It is not a de Polignac number, because 256290823 - 2¹ = 256290821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 6926779 = 256290823 / (2 + 5 + 6 + 2 + 9 + 0 + 8 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256290821) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3463353 + ... + 3463426.

It is an arithmetic number, because the mean of its divisors is an integer number (65804410).

Almost surely, 2^256290823 is an apocalyptic number.

256290823 is a deficient number, since it is larger than the sum of its proper divisors (6926817).

256290823 is an equidigital number, since it uses as much as digits as its factorization.

256290823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6926816.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 256290823 is about 16009.0856390988. The cubic root of 256290823 is about 635.2007739277.

The spelling of 256290823 in words is "two hundred fifty-six million, two hundred ninety thousand, eight hundred twenty-three".