812820140132 has 144 divisors (see below), whose sum is σ = 1921953043584. Its totient is φ = 292076928000.

The previous prime is 812820140117. The next prime is 812820140141. The reversal of 812820140132 is 231041028218.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68754782 + ... + 68766602.

It is an arithmetic number, because the mean of its divisors is an integer number (13346896136).

Almost surely, 2^812820140132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812820140132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (960976521792).

812820140132 is an abundant number, since it is smaller than the sum of its proper divisors (1109132903452).

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

812820140132 is a wasteful number, since it uses less digits than its factorization.

812820140132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13190 (or 13175 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The spelling of 812820140132 in words is "eight hundred twelve billion, eight hundred twenty million, one hundred forty thousand, one hundred thirty-two".