256083865 has 8 divisors (see below), whose sum is σ = 311629248. Its totient is φ = 201981360.

The previous prime is 256083859. The next prime is 256083899. The reversal of 256083865 is 568380652.

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 256083865 - 2¹⁵ = 256051097 is a prime.

It is a Duffinian number.

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, 360327 + ... + 361036.

It is an arithmetic number, because the mean of its divisors is an integer number (38953656).

Almost surely, 2^256083865 is an apocalyptic number.

It is an amenable number.

256083865 is a deficient number, since it is larger than the sum of its proper divisors (55545383).

256083865 is an equidigital number, since it uses as much as digits as its factorization.

256083865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721439.

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 256083865 is about 16002.6205666447. The cubic root of 256083865 is about 635.0297503990.

The spelling of 256083865 in words is "two hundred fifty-six million, eighty-three thousand, eight hundred sixty-five".