812020816 has 20 divisors (see below), whose sum is σ = 1574006400. Its totient is φ = 405825632.

The previous prime is 812020787. The next prime is 812020817. The reversal of 812020816 is 618020218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812020817) 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, 29025 + ... + 49663.

It is an arithmetic number, because the mean of its divisors is an integer number (78700320).

Almost surely, 2^812020816 is an apocalyptic number.

It is an amenable number.

812020816 is a deficient number, since it is larger than the sum of its proper divisors (761985584).

812020816 is a wasteful number, since it uses less digits than its factorization.

812020816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23106 (or 23100 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 812020816 is about 28495.9789444055. The cubic root of 812020816 is about 932.9443111170.

The spelling of 812020816 in words is "eight hundred twelve million, twenty thousand, eight hundred sixteen".