172199728 has 20 divisors (see below), whose sum is σ = 340737120. Its totient is φ = 84267584.

The previous prime is 172199723. The next prime is 172199737. The reversal of 172199728 is 827991271.

It is not an unprimeable number, because it can be changed into a prime (172199723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113743 + ... + 115246.

It is an arithmetic number, because the mean of its divisors is an integer number (17036856).

Almost surely, 2^172199728 is an apocalyptic number.

It is an amenable number.

172199728 is a deficient number, since it is larger than the sum of its proper divisors (168537392).

172199728 is a wasteful number, since it uses less digits than its factorization.

172199728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229044 (or 229038 counting only the distinct ones).

The product of its digits is 127008, while the sum is 46.

The square root of 172199728 is about 13122.4893979763. The cubic root of 172199728 is about 556.3449544081.

The spelling of 172199728 in words is "one hundred seventy-two million, one hundred ninety-nine thousand, seven hundred twenty-eight".