256204673 has 4 divisors (see below), whose sum is σ = 256816560. Its totient is φ = 255592788.

The previous prime is 256204667. The next prime is 256204679. The reversal of 256204673 is 376402652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (256204667) and next prime (256204679).

It is a cyclic number.

It is not a de Polignac number, because 256204673 - 2⁴ = 256204657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256204679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305315 + ... + 306152.

It is an arithmetic number, because the mean of its divisors is an integer number (64204140).

Almost surely, 2^256204673 is an apocalyptic number.

It is an amenable number.

256204673 is a deficient number, since it is larger than the sum of its proper divisors (611887).

256204673 is an equidigital number, since it uses as much as digits as its factorization.

256204673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611886.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 256204673 is about 16006.3947533478. The cubic root of 256204673 is about 635.1295934895.

It can be divided in two parts, 25620467 and 3, that multiplied together give a triangular number (76861401 = T₁₂₃₉₈).

The spelling of 256204673 in words is "two hundred fifty-six million, two hundred four thousand, six hundred seventy-three".