812335872 has 72 divisors (see below), whose sum is σ = 2194405696. Its totient is φ = 266720256.

The previous prime is 812335807. The next prime is 812335889. The reversal of 812335872 is 278533218.

It is a self number, because there is not a number n which added to its sum of digits gives 812335872.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43563 + ... + 59349.

Almost surely, 2^812335872 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 812335872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097202848).

812335872 is an abundant number, since it is smaller than the sum of its proper divisors (1382069824).

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

812335872 is a wasteful number, since it uses less digits than its factorization.

812335872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15873 (or 15859 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 812335872 is about 28501.5064865000. The cubic root of 812335872 is about 933.0649532202.

The spelling of 812335872 in words is "eight hundred twelve million, three hundred thirty-five thousand, eight hundred seventy-two".