256839448068 has 72 divisors (see below), whose sum is σ = 767566188480. Its totient is φ = 70852259520.

The previous prime is 256839448057. The next prime is 256839448079. The reversal of 256839448068 is 860844938652.

256839448068 is a `hidden beast` number, since 2 + 5 + 6 + 8 + 3 + 94 + 480 + 68 = 666.

It is an interprime number because it is at equal distance from previous prime (256839448057) and next prime (256839448079).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 256839447996 and 256839448014.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17565178 + ... + 17579793.

Almost surely, 2^256839448068 is an apocalyptic number.

256839448068 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

256839448068 is an abundant number, since it is smaller than the sum of its proper divisors (510726740412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256839448068 is a wasteful number, since it uses less digits than its factorization.

256839448068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35145017 (or 35145012 counting only the distinct ones).

The product of its (nonzero) digits is 79626240, while the sum is 63.

The spelling of 256839448068 in words is "two hundred fifty-six billion, eight hundred thirty-nine million, four hundred forty-eight thousand, sixty-eight".