256999999 has 8 divisors (see below), whose sum is σ = 283949280. Its totient is φ = 231365376.

The previous prime is 256999993. The next prime is 257000011. The reversal of 256999999 is 999999652.

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

It is not a de Polignac number, because 256999999 - 2³ = 256999991 is a prime.

It is a Duffinian number.

256999999 is a modest number, since divided by 99999 gives 2569 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256999991) 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, 328254 + ... + 329035.

It is an arithmetic number, because the mean of its divisors is an integer number (35493660).

Almost surely, 2^256999999 is an apocalyptic number.

256999999 is a deficient number, since it is larger than the sum of its proper divisors (26949281).

256999999 is a wasteful number, since it uses less digits than its factorization.

256999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657329.

The product of its digits is 31886460, while the sum is 67.

The square root of 256999999 is about 16031.2195106923. The cubic root of 256999999 is about 635.7861171488.

The spelling of 256999999 in words is "two hundred fifty-six million, nine hundred ninety-nine thousand, nine hundred ninety-nine".