812708172 has 36 divisors (see below), whose sum is σ = 2066662416. Its totient is φ = 269278560.

The previous prime is 812708159. The next prime is 812708173. The reversal of 812708172 is 271807218.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (812708173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61579 + ... + 73602.

Almost surely, 2^812708172 is an apocalyptic number.

It is an amenable number.

812708172 is an abundant number, since it is smaller than the sum of its proper divisors (1253954244).

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

812708172 is a wasteful number, since it uses less digits than its factorization.

812708172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135358 (or 135353 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 812708172 is about 28508.0369720540. The cubic root of 812708172 is about 933.2074751492.

The spelling of 812708172 in words is "eight hundred twelve million, seven hundred eight thousand, one hundred seventy-two".