812551273800 has 192 divisors, whose sum is σ = 2880210357120. Its totient is φ = 185631989760.

The previous prime is 812551273799. The next prime is 812551273871. The reversal of 812551273800 is 8372155218.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8423442 + ... + 8519358.

It is an arithmetic number, because the mean of its divisors is an integer number (15001095610).

Almost surely, 2^812551273800 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 812551273800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1440105178560).

812551273800 is an abundant number, since it is smaller than the sum of its proper divisors (2067659083320).

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

812551273800 is a wasteful number, since it uses less digits than its factorization.

812551273800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97960 (or 97951 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The spelling of 812551273800 in words is "eight hundred twelve billion, five hundred fifty-one million, two hundred seventy-three thousand, eight hundred".