256304649 has 8 divisors (see below), whose sum is σ = 341815680. Its totient is φ = 170831696.

The previous prime is 256304641. The next prime is 256304687. The reversal of 256304649 is 946403652.

256304649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 256304649 - 2³ = 256304641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256304641) 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, 15847 + ... + 27635.

It is an arithmetic number, because the mean of its divisors is an integer number (42726960).

Almost surely, 2^256304649 is an apocalyptic number.

It is an amenable number.

256304649 is a deficient number, since it is larger than the sum of its proper divisors (85511031).

256304649 is a wasteful number, since it uses less digits than its factorization.

256304649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19039.

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 256304649 is about 16009.5174505667. The cubic root of 256304649 is about 635.2121960144.

The spelling of 256304649 in words is "two hundred fifty-six million, three hundred four thousand, six hundred forty-nine".