805720856 has 16 divisors (see below), whose sum is σ = 1531422600. Its totient is φ = 397341504.

The previous prime is 805720847. The next prime is 805720913. The reversal of 805720856 is 658027508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689246 + ... + 690413.

Almost surely, 2^805720856 is an apocalyptic number.

It is an amenable number.

805720856 is a deficient number, since it is larger than the sum of its proper divisors (725701744).

805720856 is a wasteful number, since it uses less digits than its factorization.

805720856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379738 (or 1379734 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 805720856 is about 28385.2224934031. Note that the first 3 decimals coincide. The cubic root of 805720856 is about 930.5253346747.

The spelling of 805720856 in words is "eight hundred five million, seven hundred twenty thousand, eight hundred fifty-six".