812131728 has 40 divisors (see below), whose sum is σ = 2102240448. Its totient is φ = 270164352.

The previous prime is 812131721. The next prime is 812131741. The reversal of 812131728 is 827131218.

It is not an unprimeable number, because it can be changed into a prime (812131721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7326 + ... + 40962.

Almost surely, 2^812131728 is an apocalyptic number.

It is an amenable number.

812131728 is an abundant number, since it is smaller than the sum of its proper divisors (1290108720).

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

812131728 is a wasteful number, since it uses less digits than its factorization.

812131728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34151 (or 34145 counting only the distinct ones).

The product of its digits is 5376, while the sum is 33.

The square root of 812131728 is about 28497.9249770926. The cubic root of 812131728 is about 932.9867854012.

The spelling of 812131728 in words is "eight hundred twelve million, one hundred thirty-one thousand, seven hundred twenty-eight".