812031520 has 96 divisors (see below), whose sum is σ = 2057529600. Its totient is φ = 301756416.

The previous prime is 812031509. The next prime is 812031533. The reversal of 812031520 is 25130218.

It is a junction number, because it is equal to n+sod(n) for n = 812031491 and 812031500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212991 + ... + 216769.

It is an arithmetic number, because the mean of its divisors is an integer number (21432600).

Almost surely, 2^812031520 is an apocalyptic number.

812031520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812031520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028764800).

812031520 is an abundant number, since it is smaller than the sum of its proper divisors (1245498080).

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

812031520 is a wasteful number, since it uses less digits than its factorization.

812031520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3890 (or 3882 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 812031520 is about 28496.1667597591. The cubic root of 812031520 is about 932.9484104339.

Adding to 812031520 its reverse (25130218), we get a palindrome (837161738).

The spelling of 812031520 in words is "eight hundred twelve million, thirty-one thousand, five hundred twenty".