812512733640 has 64 divisors (see below), whose sum is σ = 2449911562560. Its totient is φ = 215570208000.

The previous prime is 812512733633. The next prime is 812512733651. The reversal of 812512733640 is 46337215218.

It is a junction number, because it is equal to n+sod(n) for n = 812512733592 and 812512733601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17161486 + ... + 17208765.

It is an arithmetic number, because the mean of its divisors is an integer number (38279868165).

Almost surely, 2^812512733640 is an apocalyptic number.

It is an amenable number.

812512733640 is an abundant number, since it is smaller than the sum of its proper divisors (1637398828920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812512733640 is a wasteful number, since it uses less digits than its factorization.

812512733640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34370462 (or 34370458 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

Adding to 812512733640 its reverse (46337215218), we get a palindrome (858849948858).

The spelling of 812512733640 in words is "eight hundred twelve billion, five hundred twelve million, seven hundred thirty-three thousand, six hundred forty".