256448787 has 8 divisors (see below), whose sum is σ = 390779136. Its totient is φ = 146542152.

The previous prime is 256448747. The next prime is 256448789. The reversal of 256448787 is 787844652.

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

It is not a de Polignac number, because 256448787 - 2⁷ = 256448659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256448789) 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 7 ways as a sum of consecutive naturals, for example, 6105903 + ... + 6105944.

It is an arithmetic number, because the mean of its divisors is an integer number (48847392).

Almost surely, 2^256448787 is an apocalyptic number.

256448787 is a deficient number, since it is larger than the sum of its proper divisors (134330349).

256448787 is a wasteful number, since it uses less digits than its factorization.

256448787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12211857.

The product of its digits is 3010560, while the sum is 51.

The square root of 256448787 is about 16014.0184525933. The cubic root of 256448787 is about 635.3312484234.

The spelling of 256448787 in words is "two hundred fifty-six million, four hundred forty-eight thousand, seven hundred eighty-seven".