256782278 has 8 divisors (see below), whose sum is σ = 391701960. Its totient is φ = 126214960.

The previous prime is 256782277. The next prime is 256782293. The reversal of 256782278 is 872287652.

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 (256782277) 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, 1087943 + ... + 1088178.

It is an arithmetic number, because the mean of its divisors is an integer number (48962745).

Almost surely, 2^256782278 is an apocalyptic number.

256782278 is a deficient number, since it is larger than the sum of its proper divisors (134919682).

256782278 is a wasteful number, since it uses less digits than its factorization.

256782278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176182.

The product of its digits is 752640, while the sum is 47.

The square root of 256782278 is about 16024.4275404771. The cubic root of 256782278 is about 635.6065281768.

The spelling of 256782278 in words is "two hundred fifty-six million, seven hundred eighty-two thousand, two hundred seventy-eight".