256343677 has 4 divisors (see below), whose sum is σ = 256383036. Its totient is φ = 256304320.

The previous prime is 256343617. The next prime is 256343699. The reversal of 256343677 is 776343652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 149303961 + 107039716 = 12219^2 + 10346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256343677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256343617) 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, 7324 + ... + 23797.

It is an arithmetic number, because the mean of its divisors is an integer number (64095759).

Almost surely, 2^256343677 is an apocalyptic number.

It is an amenable number.

256343677 is a deficient number, since it is larger than the sum of its proper divisors (39359).

256343677 is an equidigital number, since it uses as much as digits as its factorization.

256343677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39358.

The product of its digits is 635040, while the sum is 43.

The square root of 256343677 is about 16010.7363041179. The cubic root of 256343677 is about 635.2444360374.

The spelling of 256343677 in words is "two hundred fifty-six million, three hundred forty-three thousand, six hundred seventy-seven".