812864452 has 24 divisors (see below), whose sum is σ = 1507796640. Its totient is φ = 382116480.

The previous prime is 812864449. The next prime is 812864453. The reversal of 812864452 is 254468218.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (812864453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63427 + ... + 75157.

It is an arithmetic number, because the mean of its divisors is an integer number (62824860).

Almost surely, 2^812864452 is an apocalyptic number.

It is an amenable number.

812864452 is a deficient number, since it is larger than the sum of its proper divisors (694932188).

812864452 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (812864451) it forms an eRAP, since the sums of their prime factors are consecutive (12770 and 12771).

812864452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12771 (or 12769 counting only the distinct ones).

The product of its digits is 122880, while the sum is 40.

The square root of 812864452 is about 28510.7778217291. Note that the first 3 decimals coincide. The cubic root of 812864452 is about 933.2672884672.

The spelling of 812864452 in words is "eight hundred twelve million, eight hundred sixty-four thousand, four hundred fifty-two".