256848639 has 8 divisors (see below), whose sum is σ = 342620160. Its totient is φ = 171154776.

The previous prime is 256848637. The next prime is 256848643. The reversal of 256848639 is 936848652.

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

It is not a de Polignac number, because 256848639 - 2¹ = 256848637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256848591 and 256848600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256848637) 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, 11199 + ... + 25280.

It is an arithmetic number, because the mean of its divisors is an integer number (42827520).

Almost surely, 2^256848639 is an apocalyptic number.

256848639 is a deficient number, since it is larger than the sum of its proper divisors (85771521).

256848639 is a wasteful number, since it uses less digits than its factorization.

256848639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38829.

The product of its digits is 2488320, while the sum is 51.

The square root of 256848639 is about 16026.4980267056. The cubic root of 256848639 is about 635.6612773495.

The spelling of 256848639 in words is "two hundred fifty-six million, eight hundred forty-eight thousand, six hundred thirty-nine".