256464823 has 2 divisors, whose sum is σ = 256464824. Its totient is φ = 256464822.

The previous prime is 256464809. The next prime is 256464847. The reversal of 256464823 is 328464652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256464823 - 2⁹ = 256464311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256464883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128232411 + 128232412.

It is an arithmetic number, because the mean of its divisors is an integer number (128232412).

Almost surely, 2^256464823 is an apocalyptic number.

256464823 is a deficient number, since it is larger than the sum of its proper divisors (1).

256464823 is an equidigital number, since it uses as much as digits as its factorization.

256464823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 40.

The square root of 256464823 is about 16014.5191310885. The cubic root of 256464823 is about 635.3444907809.

The spelling of 256464823 in words is "two hundred fifty-six million, four hundred sixty-four thousand, eight hundred twenty-three".