256777345 has 8 divisors (see below), whose sum is σ = 336144960. Its totient is φ = 186747120.

The previous prime is 256777331. The next prime is 256777351. The reversal of 256777345 is 543777652.

It is a happy number.

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

It is not a de Polignac number, because 256777345 - 2⁹ = 256776833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256777295 and 256777304.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2334285 + ... + 2334394.

It is an arithmetic number, because the mean of its divisors is an integer number (42018120).

Almost surely, 2^256777345 is an apocalyptic number.

It is an amenable number.

256777345 is a deficient number, since it is larger than the sum of its proper divisors (79367615).

256777345 is a wasteful number, since it uses less digits than its factorization.

256777345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4668695.

The product of its digits is 1234800, while the sum is 46.

The square root of 256777345 is about 16024.2736184827. The cubic root of 256777345 is about 635.6024579750.

The spelling of 256777345 in words is "two hundred fifty-six million, seven hundred seventy-seven thousand, three hundred forty-five".