812705806 has 16 divisors (see below), whose sum is σ = 1351685808. Its totient is φ = 363355200.

The previous prime is 812705771. The next prime is 812705809. The reversal of 812705806 is 608507218.

It is a super-2 number, since 2×812705806² = 1320981454212219272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812705809) 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, 301455 + ... + 304138.

It is an arithmetic number, because the mean of its divisors is an integer number (84480363).

Almost surely, 2^812705806 is an apocalyptic number.

812705806 is a deficient number, since it is larger than the sum of its proper divisors (538980002).

812705806 is a wasteful number, since it uses less digits than its factorization.

812705806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605667.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 812705806 is about 28507.9954749540. The cubic root of 812705806 is about 933.2065695470.

The spelling of 812705806 in words is "eight hundred twelve million, seven hundred five thousand, eight hundred six".