172729798912 has 144 divisors (see below), whose sum is σ = 398235136320. Its totient is φ = 73947340800.

The previous prime is 172729798889. The next prime is 172729798921. The reversal of 172729798912 is 219897927271.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9246862 + ... + 9265522.

It is an arithmetic number, because the mean of its divisors is an integer number (2765521780).

Almost surely, 2^172729798912 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 172729798912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199117568160).

172729798912 is an abundant number, since it is smaller than the sum of its proper divisors (225505337408).

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

172729798912 is a wasteful number, since it uses less digits than its factorization.

172729798912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18880 (or 18866 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 64.

The spelling of 172729798912 in words is "one hundred seventy-two billion, seven hundred twenty-nine million, seven hundred ninety-eight thousand, nine hundred twelve".