256678145 has 4 divisors (see below), whose sum is σ = 308013780. Its totient is φ = 205342512.

The previous prime is 256678141. The next prime is 256678151. The reversal of 256678145 is 541876652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 129800449 + 126877696 = 11393^2 + 11264^2 .

It is a cyclic number.

It is not a de Polignac number, because 256678145 - 2² = 256678141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256678096 and 256678105.

It is not an unprimeable number, because it can be changed into a prime (256678141) 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, 25667810 + ... + 25667819.

It is an arithmetic number, because the mean of its divisors is an integer number (77003445).

Almost surely, 2^256678145 is an apocalyptic number.

It is an amenable number.

256678145 is a deficient number, since it is larger than the sum of its proper divisors (51335635).

256678145 is an equidigital number, since it uses as much as digits as its factorization.

256678145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51335634.

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

The square root of 256678145 is about 16021.1780153645. The cubic root of 256678145 is about 635.5205973198.

The spelling of 256678145 in words is "two hundred fifty-six million, six hundred seventy-eight thousand, one hundred forty-five".