256884605 has 8 divisors (see below), whose sum is σ = 308528352. Its totient is φ = 205329808.

The previous prime is 256884601. The next prime is 256884613. The reversal of 256884605 is 506488652.

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 256884605 - 2² = 256884601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256884601) 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, 15707 + ... + 27576.

It is an arithmetic number, because the mean of its divisors is an integer number (38566044).

Almost surely, 2^256884605 is an apocalyptic number.

It is an amenable number.

256884605 is a deficient number, since it is larger than the sum of its proper divisors (51643747).

256884605 is a wasteful number, since it uses less digits than its factorization.

256884605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44475.

The product of its (nonzero) digits is 460800, while the sum is 44.

The square root of 256884605 is about 16027.6200666225. The cubic root of 256884605 is about 635.6909460895.

The spelling of 256884605 in words is "two hundred fifty-six million, eight hundred eighty-four thousand, six hundred five".