812204645 has 12 divisors (see below), whose sum is σ = 1133771724. Its totient is φ = 556940160.

The previous prime is 812204599. The next prime is 812204651. The reversal of 812204645 is 546402218.

It can be written as a sum of positive squares in 2 ways, for example, as 356680996 + 455523649 = 18886^2 + 21343^2 .

It is not a de Polignac number, because 812204645 - 2⁶ = 812204581 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, 1657316 + ... + 1657805.

It is an arithmetic number, because the mean of its divisors is an integer number (94480977).

Almost surely, 2^812204645 is an apocalyptic number.

It is an amenable number.

812204645 is a deficient number, since it is larger than the sum of its proper divisors (321567079).

812204645 is a wasteful number, since it uses less digits than its factorization.

812204645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315140 (or 3315133 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 812204645 is about 28499.2042871376. The cubic root of 812204645 is about 933.0147072104.

The spelling of 812204645 in words is "eight hundred twelve million, two hundred four thousand, six hundred forty-five".