172728106 has 4 divisors (see below), whose sum is σ = 259092162. Its totient is φ = 86364052.

The previous prime is 172728097. The next prime is 172728131. The reversal of 172728106 is 601827271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 601827271 = 223 ⋅2698777.

It can be written as a sum of positive squares in only one way, i.e., 140635881 + 32092225 = 11859^2 + 5665^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43182025 + ... + 43182028.

Almost surely, 2^172728106 is an apocalyptic number.

172728106 is a deficient number, since it is larger than the sum of its proper divisors (86364056).

172728106 is an equidigital number, since it uses as much as digits as its factorization.

172728106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86364055.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 172728106 is about 13142.6065146911. The cubic root of 172728106 is about 556.9134033952.

The spelling of 172728106 in words is "one hundred seventy-two million, seven hundred twenty-eight thousand, one hundred six".