256212178 has 4 divisors (see below), whose sum is σ = 384318270. Its totient is φ = 128106088.

The previous prime is 256212137. The next prime is 256212223. The reversal of 256212178 is 871212652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 139074849 + 117137329 = 11793^2 + 10823^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64053043 + ... + 64053046.

Almost surely, 2^256212178 is an apocalyptic number.

256212178 is a deficient number, since it is larger than the sum of its proper divisors (128106092).

256212178 is a wasteful number, since it uses less digits than its factorization.

256212178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128106091.

The product of its digits is 13440, while the sum is 34.

The square root of 256212178 is about 16006.6291891828. The cubic root of 256212178 is about 635.1357950431.

The spelling of 256212178 in words is "two hundred fifty-six million, two hundred twelve thousand, one hundred seventy-eight".