812520844 has 24 divisors (see below), whose sum is σ = 1435012880. Its totient is φ = 402532416.

The previous prime is 812520829. The next prime is 812520847. The reversal of 812520844 is 448025218.

It is not an unprimeable number, because it can be changed into a prime (812520847) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 247687 + ... + 250945.

Almost surely, 2^812520844 is an apocalyptic number.

It is an amenable number.

812520844 is a deficient number, since it is larger than the sum of its proper divisors (622492036).

812520844 is a wasteful number, since it uses less digits than its factorization.

812520844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3817 (or 3815 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 34.

The square root of 812520844 is about 28504.7512530806. The cubic root of 812520844 is about 933.1357686707.

The spelling of 812520844 in words is "eight hundred twelve million, five hundred twenty thousand, eight hundred forty-four".