256579978 has 8 divisors (see below), whose sum is σ = 395271972. Its totient is φ = 124822656.

The previous prime is 256579957. The next prime is 256579979. The reversal of 256579978 is 879975652.

256579978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 253541929 + 3038049 = 15923^2 + 1743^2 .

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

It is a super-2 number, since 2×256579978² = 131666570220960968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256579979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1733575 + ... + 1733722.

Almost surely, 2^256579978 is an apocalyptic number.

256579978 is a deficient number, since it is larger than the sum of its proper divisors (138691994).

256579978 is a wasteful number, since it uses less digits than its factorization.

256579978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3467336.

The product of its digits is 9525600, while the sum is 58.

The square root of 256579978 is about 16018.1140587773. The cubic root of 256579978 is about 635.4395683389.

The spelling of 256579978 in words is "two hundred fifty-six million, five hundred seventy-nine thousand, nine hundred seventy-eight".