805670256 has 80 divisors (see below), whose sum is σ = 2210778144. Its totient is φ = 251953152.

The previous prime is 805670251. The next prime is 805670323. The reversal of 805670256 is 652076508.

It is a happy number.

It is a super-2 number, since 2×805670256² = 1298209122806211072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805670251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286650 + ... + 289446.

Almost surely, 2^805670256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 805670256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1105389072).

805670256 is an abundant number, since it is smaller than the sum of its proper divisors (1405107888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

805670256 is a wasteful number, since it uses less digits than its factorization.

805670256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3178 (or 3172 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 805670256 is about 28384.3311705596. The cubic root of 805670256 is about 930.5058549888.

It can be divided in two parts, 805 and 670256, that added together give a triangular number (671061 = T₁₁₅₈).

The spelling of 805670256 in words is "eight hundred five million, six hundred seventy thousand, two hundred fifty-six".