812564005 has 12 divisors (see below), whose sum is σ = 1071779436. Its totient is φ = 590955200.

The previous prime is 812563957. The next prime is 812564017. The reversal of 812564005 is 500465218.

It can be written as a sum of positive squares in 2 ways, for example, as 443270916 + 369293089 = 21054^2 + 19217^2 .

It is not a de Polignac number, because 812564005 - 2²⁵ = 779009573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 670936 + ... + 672145.

It is an arithmetic number, because the mean of its divisors is an integer number (89314953).

Almost surely, 2^812564005 is an apocalyptic number.

It is an amenable number.

812564005 is a deficient number, since it is larger than the sum of its proper divisors (259215431).

812564005 is a wasteful number, since it uses less digits than its factorization.

812564005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343108 (or 1343097 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 812564005 is about 28505.5083273391. The cubic root of 812564005 is about 933.1522910611.

The spelling of 812564005 in words is "eight hundred twelve million, five hundred sixty-four thousand, five".