256841648 has 40 divisors (see below), whose sum is σ = 576748800. Its totient is φ = 108521280.

The previous prime is 256841633. The next prime is 256841743. The reversal of 256841648 is 846148652.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 256841599 and 256841608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8198 + ... + 24101.

It is an arithmetic number, because the mean of its divisors is an integer number (14418720).

Almost surely, 2^256841648 is an apocalyptic number.

256841648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

256841648 is an abundant number, since it is smaller than the sum of its proper divisors (319907152).

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

256841648 is a wasteful number, since it uses less digits than its factorization.

256841648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32385 (or 32379 counting only the distinct ones).

The product of its digits is 368640, while the sum is 44.

The square root of 256841648 is about 16026.2799176852. The cubic root of 256841648 is about 635.6555100769.

The spelling of 256841648 in words is "two hundred fifty-six million, eight hundred forty-one thousand, six hundred forty-eight".