812528729 has 4 divisors (see below), whose sum is σ = 817018020. Its totient is φ = 808039440.

The previous prime is 812528713. The next prime is 812528747. The reversal of 812528729 is 927825218.

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 46512400 + 766016329 = 6820^2 + 27677^2 .

It is a cyclic number.

It is not a de Polignac number, because 812528729 - 2⁴ = 812528713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 812528729.

It is not an unprimeable number, because it can be changed into a prime (812528329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2244374 + ... + 2244735.

It is an arithmetic number, because the mean of its divisors is an integer number (204254505).

Almost surely, 2^812528729 is an apocalyptic number.

It is an amenable number.

812528729 is a deficient number, since it is larger than the sum of its proper divisors (4489291).

812528729 is a wasteful number, since it uses less digits than its factorization.

812528729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489290.

The product of its digits is 161280, while the sum is 44.

The square root of 812528729 is about 28504.8895630206. The cubic root of 812528729 is about 933.1387871581.

The spelling of 812528729 in words is "eight hundred twelve million, five hundred twenty-eight thousand, seven hundred twenty-nine".