256455645 has 8 divisors (see below), whose sum is σ = 410329056. Its totient is φ = 136776336.

The previous prime is 256455637. The next prime is 256455677. The reversal of 256455645 is 546554652.

It is a happy number.

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

It is not a de Polignac number, because 256455645 - 2³ = 256455637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256455597 and 256455606.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8548507 + ... + 8548536.

It is an arithmetic number, because the mean of its divisors is an integer number (51291132).

Almost surely, 2^256455645 is an apocalyptic number.

It is an amenable number.

256455645 is a deficient number, since it is larger than the sum of its proper divisors (153873411).

256455645 is a wasteful number, since it uses less digits than its factorization.

256455645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17097051.

The product of its digits is 720000, while the sum is 42.

The square root of 256455645 is about 16014.2325760556. The cubic root of 256455645 is about 635.3369117541.

The spelling of 256455645 in words is "two hundred fifty-six million, four hundred fifty-five thousand, six hundred forty-five".