256700289 has 8 divisors (see below), whose sum is σ = 362400480. Its totient is φ = 161066816.

The previous prime is 256700267. The next prime is 256700291. The reversal of 256700289 is 982007652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256700289 - 2⁷ = 256700161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256700219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2516619 + ... + 2516720.

It is an arithmetic number, because the mean of its divisors is an integer number (45300060).

Almost surely, 2^256700289 is an apocalyptic number.

It is an amenable number.

256700289 is a deficient number, since it is larger than the sum of its proper divisors (105700191).

256700289 is a wasteful number, since it uses less digits than its factorization.

256700289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5033359.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 256700289 is about 16021.8690857216. The cubic root of 256700289 is about 635.5388725589.

The spelling of 256700289 in words is "two hundred fifty-six million, seven hundred thousand, two hundred eighty-nine".