812244540 has 96 divisors (see below), whose sum is σ = 2391814656. Its totient is φ = 205553920.

The previous prime is 812244533. The next prime is 812244571. The reversal of 812244540 is 45442218.

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

It is a junction number, because it is equal to n+sod(n) for n = 812244498 and 812244507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178534 + ... + 183026.

It is an arithmetic number, because the mean of its divisors is an integer number (24914736).

Almost surely, 2^812244540 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 812244540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1195907328).

812244540 is an abundant number, since it is smaller than the sum of its proper divisors (1579570116).

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

812244540 is a wasteful number, since it uses less digits than its factorization.

812244540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659 (or 4657 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 30.

The square root of 812244540 is about 28499.9042103653. The cubic root of 812244540 is about 933.0299833326.

Adding to 812244540 its reverse (45442218), we get a palindrome (857686758).

The spelling of 812244540 in words is "eight hundred twelve million, two hundred forty-four thousand, five hundred forty".