812730005 has 4 divisors (see below), whose sum is σ = 975276012. Its totient is φ = 650184000.

The previous prime is 812729993. The next prime is 812730019. The reversal of 812730005 is 500037218.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 586317796 + 226412209 = 24214^2 + 15047^2 .

It is not a de Polignac number, because 812730005 - 2¹⁸ = 812467861 is a prime.

It is a super-2 number, since 2×812730005² = 1321060122054600050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81272996 + ... + 81273005.

It is an arithmetic number, because the mean of its divisors is an integer number (243819003).

Almost surely, 2^812730005 is an apocalyptic number.

It is an amenable number.

812730005 is a deficient number, since it is larger than the sum of its proper divisors (162546007).

812730005 is a wasteful number, since it uses less digits than its factorization.

812730005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162546006.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 812730005 is about 28508.4198965849. The cubic root of 812730005 is about 933.2158317923.

The spelling of 812730005 in words is "eight hundred twelve million, seven hundred thirty thousand, five".