256387648 has 28 divisors (see below), whose sum is σ = 555022512. Its totient is φ = 116539520.

The previous prime is 256387643. The next prime is 256387661. The reversal of 256387648 is 846783652.

It is not an unprimeable number, because it can be changed into a prime (256387643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181390 + ... + 182797.

Almost surely, 2^256387648 is an apocalyptic number.

It is an amenable number.

256387648 is an abundant number, since it is smaller than the sum of its proper divisors (298634864).

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

256387648 is a wasteful number, since it uses less digits than its factorization.

256387648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364210 (or 364200 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 49.

The square root of 256387648 is about 16012.1094175627. The cubic root of 256387648 is about 635.2807554251.

The spelling of 256387648 in words is "two hundred fifty-six million, three hundred eighty-seven thousand, six hundred forty-eight".