172721741772 has 96 divisors (see below), whose sum is σ = 433907712000. Its totient is φ = 53302784832.

The previous prime is 172721741747. The next prime is 172721741779. The reversal of 172721741772 is 277147127271.

It is not an unprimeable number, because it can be changed into a prime (172721741779) 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, 7307229 + ... + 7330827.

It is an arithmetic number, because the mean of its divisors is an integer number (4519872000).

Almost surely, 2^172721741772 is an apocalyptic number.

172721741772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172721741772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216953856000).

172721741772 is an abundant number, since it is smaller than the sum of its proper divisors (261185970228).

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

172721741772 is a wasteful number, since it uses less digits than its factorization.

172721741772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24355 (or 24353 counting only the distinct ones).

The product of its digits is 537824, while the sum is 48.

The spelling of 172721741772 in words is "one hundred seventy-two billion, seven hundred twenty-one million, seven hundred forty-one thousand, seven hundred seventy-two".