812147668 has 12 divisors (see below), whose sum is σ = 1470267540. Its totient is φ = 392071232.

The previous prime is 812147659. The next prime is 812147689. The reversal of 812147668 is 866741218.

It can be written as a sum of positive squares in 2 ways, for example, as 422795844 + 389351824 = 20562^2 + 19732^2 .

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, 3500521 + ... + 3500752.

It is an arithmetic number, because the mean of its divisors is an integer number (122522295).

Almost surely, 2^812147668 is an apocalyptic number.

It is an amenable number.

812147668 is a deficient number, since it is larger than the sum of its proper divisors (658119872).

812147668 is a wasteful number, since it uses less digits than its factorization.

812147668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001306 (or 7001304 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 812147668 is about 28498.2046452053. The cubic root of 812147668 is about 932.9928893830.

The spelling of 812147668 in words is "eight hundred twelve million, one hundred forty-seven thousand, six hundred sixty-eight".