256205915 has 8 divisors (see below), whose sum is σ = 351368160. Its totient is φ = 175684032.

The previous prime is 256205891. The next prime is 256205941. The reversal of 256205915 is 519502652.

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 256205915 - 2¹⁰ = 256204891 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 7320169 = 256205915 / (2 + 5 + 6 + 2 + 0 + 5 + 9 + 1 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3660050 + ... + 3660119.

It is an arithmetic number, because the mean of its divisors is an integer number (43921020).

Almost surely, 2^256205915 is an apocalyptic number.

256205915 is a deficient number, since it is larger than the sum of its proper divisors (95162245).

256205915 is an equidigital number, since it uses as much as digits as its factorization.

256205915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7320181.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 256205915 is about 16006.4335502947. The cubic root of 256205915 is about 635.1306197909.

The spelling of 256205915 in words is "two hundred fifty-six million, two hundred five thousand, nine hundred fifteen".