812209800 has 96 divisors (see below), whose sum is σ = 2576486880. Its totient is φ = 211545600.

The previous prime is 812209759. The next prime is 812209819. The reversal of 812209800 is 8902218.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10060 + ... + 41540.

It is an arithmetic number, because the mean of its divisors is an integer number (26838405).

Almost surely, 2^812209800 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 812209800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1288243440).

812209800 is an abundant number, since it is smaller than the sum of its proper divisors (1764277080).

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

812209800 is a wasteful number, since it uses less digits than its factorization.

812209800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31543 (or 31534 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 812209800 is about 28499.2947281156. The cubic root of 812209800 is about 933.0166811302.

The spelling of 812209800 in words is "eight hundred twelve million, two hundred nine thousand, eight hundred".