256415678 has 8 divisors (see below), whose sum is σ = 404866920. Its totient is φ = 121460040.

The previous prime is 256415671. The next prime is 256415683. The reversal of 256415678 is 876514652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256415671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3373853 + ... + 3373928.

It is an arithmetic number, because the mean of its divisors is an integer number (50608365).

Almost surely, 2^256415678 is an apocalyptic number.

256415678 is a deficient number, since it is larger than the sum of its proper divisors (148451242).

256415678 is a wasteful number, since it uses less digits than its factorization.

256415678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6747802.

The product of its digits is 403200, while the sum is 44.

The square root of 256415678 is about 16012.9846686993. The cubic root of 256415678 is about 635.3039056182.

The spelling of 256415678 in words is "two hundred fifty-six million, four hundred fifteen thousand, six hundred seventy-eight".