812168320 has 32 divisors (see below), whose sum is σ = 1941591420. Its totient is φ = 324867072.

The previous prime is 812168311. The next prime is 812168321. The reversal of 812168320 is 23861218.

It can be written as a sum of positive squares in 2 ways, for example, as 811566144 + 602176 = 28488^2 + 776^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (812168321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633867 + ... + 635146.

Almost surely, 2^812168320 is an apocalyptic number.

812168320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

812168320 is an abundant number, since it is smaller than the sum of its proper divisors (1129423100).

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

812168320 is a wasteful number, since it uses less digits than its factorization.

812168320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269032 (or 1269020 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 812168320 is about 28498.5669815168. The cubic root of 812168320 is about 933.0007976353. Note that the first 3 decimals are identical.

The spelling of 812168320 in words is "eight hundred twelve million, one hundred sixty-eight thousand, three hundred twenty".