812816862 has 64 divisors (see below), whose sum is σ = 1913829120. Its totient is φ = 226886400.

The previous prime is 812816861. The next prime is 812816897. The reversal of 812816862 is 268618218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812816861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 693537 + ... + 694707.

It is an arithmetic number, because the mean of its divisors is an integer number (29903580).

Almost surely, 2^812816862 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812816862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (956914560).

812816862 is an abundant number, since it is smaller than the sum of its proper divisors (1101012258).

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

812816862 is a wasteful number, since it uses less digits than its factorization.

812816862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009.

The product of its digits is 73728, while the sum is 42.

The square root of 812816862 is about 28509.9432128512. The cubic root of 812816862 is about 933.2490750751.

The spelling of 812816862 in words is "eight hundred twelve million, eight hundred sixteen thousand, eight hundred sixty-two".