256128677 has 8 divisors (see below), whose sum is σ = 293318592. Its totient is φ = 219088800.

The previous prime is 256128673. The next prime is 256128731. The reversal of 256128677 is 776821652.

256128677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 256128677 - 2² = 256128673 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256128671) 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, 33824 + ... + 40697.

It is an arithmetic number, because the mean of its divisors is an integer number (36664824).

Almost surely, 2^256128677 is an apocalyptic number.

It is an amenable number.

256128677 is a deficient number, since it is larger than the sum of its proper divisors (37189915).

256128677 is an equidigital number, since it uses as much as digits as its factorization.

256128677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75019.

The product of its digits is 282240, while the sum is 44.

The square root of 256128677 is about 16004.0206510739. The cubic root of 256128677 is about 635.0667894284.

The spelling of 256128677 in words is "two hundred fifty-six million, one hundred twenty-eight thousand, six hundred seventy-seven".