256306673 has 8 divisors (see below), whose sum is σ = 293537280. Its totient is φ = 219229920.

The previous prime is 256306657. The next prime is 256306717. The reversal of 256306673 is 376603652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256306673 - 2⁴ = 256306657 is a prime.

It is a super-2 number, since 2×256306673² = 131386221248657858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256306613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34868 + ... + 41573.

It is an arithmetic number, because the mean of its divisors is an integer number (36692160).

Almost surely, 2^256306673 is an apocalyptic number.

It is an amenable number.

256306673 is a deficient number, since it is larger than the sum of its proper divisors (37230607).

256306673 is an equidigital number, since it uses as much as digits as its factorization.

256306673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76927.

The product of its (nonzero) digits is 136080, while the sum is 38.

The square root of 256306673 is about 16009.5806628406. The cubic root of 256306673 is about 635.2138680690.

The spelling of 256306673 in words is "two hundred fifty-six million, three hundred six thousand, six hundred seventy-three".