812243720 has 64 divisors (see below), whose sum is σ = 1850385600. Its totient is φ = 320866560.

The previous prime is 812243713. The next prime is 812243723. The reversal of 812243720 is 27342218.

It is not an unprimeable number, because it can be changed into a prime (812243723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1929110 + ... + 1929530.

It is an arithmetic number, because the mean of its divisors is an integer number (28912275).

Almost surely, 2^812243720 is an apocalyptic number.

It is an amenable number.

812243720 is an abundant number, since it is smaller than the sum of its proper divisors (1038141880).

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

812243720 is a wasteful number, since it uses less digits than its factorization.

812243720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 914 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 812243720 is about 28499.8898243484. The cubic root of 812243720 is about 933.0296693529.

Adding to 812243720 its reverse (27342218), we get a palindrome (839585938).

The spelling of 812243720 in words is "eight hundred twelve million, two hundred forty-three thousand, seven hundred twenty".