256580642 has 8 divisors (see below), whose sum is σ = 386695632. Its totient is φ = 127682100.

The previous prime is 256580641. The next prime is 256580647. The reversal of 256580642 is 246085652.

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

It is a junction number, because it is equal to n+sod(n) for n = 256580596 and 256580605.

It is not an unprimeable number, because it can be changed into a prime (256580641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303584 + ... + 304427.

It is an arithmetic number, because the mean of its divisors is an integer number (48336954).

Almost surely, 2^256580642 is an apocalyptic number.

256580642 is a deficient number, since it is larger than the sum of its proper divisors (130114990).

256580642 is a wasteful number, since it uses less digits than its factorization.

256580642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608224.

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 256580642 is about 16018.1347852988. The cubic root of 256580642 is about 635.4401164870.

The spelling of 256580642 in words is "two hundred fifty-six million, five hundred eighty thousand, six hundred forty-two".