812864788 has 6 divisors (see below), whose sum is σ = 1422513386. Its totient is φ = 406432392.

The previous prime is 812864747. The next prime is 812864791. The reversal of 812864788 is 887468218.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 767733264 + 45131524 = 27708^2 + 6718^2 .

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 as a sum of consecutive naturals, namely, 101608095 + ... + 101608102.

Almost surely, 2^812864788 is an apocalyptic number.

It is an amenable number.

812864788 is a deficient number, since it is larger than the sum of its proper divisors (609648598).

812864788 is a wasteful number, since it uses less digits than its factorization.

812864788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203216201 (or 203216199 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 52.

The square root of 812864788 is about 28510.7837142370. The cubic root of 812864788 is about 933.2674170568.

The spelling of 812864788 in words is "eight hundred twelve million, eight hundred sixty-four thousand, seven hundred eighty-eight".