812718500 has 96 divisors (see below), whose sum is σ = 1955850624. Its totient is φ = 292560000.

The previous prime is 812718499. The next prime is 812718503. The reversal of 812718500 is 5817218.

It is a happy number.

It is a super-2 number, since 2×812718500² = 1321022720484500000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (812718503) 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, 587810 + ... + 589190.

It is an arithmetic number, because the mean of its divisors is an integer number (20373444).

Almost surely, 2^812718500 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 812718500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (977925312).

812718500 is an abundant number, since it is smaller than the sum of its proper divisors (1143132124).

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

812718500 is a wasteful number, since it uses less digits than its factorization.

812718500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518 (or 1506 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 812718500 is about 28508.2181133792. The cubic root of 812718500 is about 933.2114282393.

The spelling of 812718500 in words is "eight hundred twelve million, seven hundred eighteen thousand, five hundred".