256677769 has 8 divisors (see below), whose sum is σ = 275077440. Its totient is φ = 238881456.

The previous prime is 256677767. The next prime is 256677779. The reversal of 256677769 is 967776652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256677769 - 2¹ = 256677767 is a prime.

It is a super-2 number, since 2×256677769² = 131766954197634722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256677761) 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, 149959 + ... + 151660.

It is an arithmetic number, because the mean of its divisors is an integer number (34384680).

Almost surely, 2^256677769 is an apocalyptic number.

It is an amenable number.

256677769 is a deficient number, since it is larger than the sum of its proper divisors (18399671).

256677769 is a wasteful number, since it uses less digits than its factorization.

256677769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301679.

The product of its digits is 6667920, while the sum is 55.

The square root of 256677769 is about 16021.1662808923. The cubic root of 256677769 is about 635.5202870014.

The spelling of 256677769 in words is "two hundred fifty-six million, six hundred seventy-seven thousand, seven hundred sixty-nine".