256777897 has 8 divisors (see below), whose sum is σ = 264645920. Its totient is φ = 248996160.

The previous prime is 256777889. The next prime is 256777903. The reversal of 256777897 is 798777652.

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 256777897 - 2³ = 256777889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256787897) 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, 15504 + ... + 27457.

It is an arithmetic number, because the mean of its divisors is an integer number (33080740).

Almost surely, 2^256777897 is an apocalyptic number.

It is an amenable number.

256777897 is a deficient number, since it is larger than the sum of its proper divisors (7868023).

256777897 is a wasteful number, since it uses less digits than its factorization.

256777897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43143.

The product of its digits is 10372320, while the sum is 58.

The square root of 256777897 is about 16024.2908423431. The cubic root of 256777897 is about 635.6029134309.

The spelling of 256777897 in words is "two hundred fifty-six million, seven hundred seventy-seven thousand, eight hundred ninety-seven".