172705073 has 4 divisors (see below), whose sum is σ = 172901988. Its totient is φ = 172508160.

The previous prime is 172705067. The next prime is 172705097. The reversal of 172705073 is 370507271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85525504 + 87179569 = 9248^2 + 9337^2 .

It is a cyclic number.

It is not a de Polignac number, because 172705073 - 2⁶ = 172705009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172704073) 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, 97136 + ... + 98897.

It is an arithmetic number, because the mean of its divisors is an integer number (43225497).

Almost surely, 2^172705073 is an apocalyptic number.

It is an amenable number.

172705073 is a deficient number, since it is larger than the sum of its proper divisors (196915).

172705073 is an equidigital number, since it uses as much as digits as its factorization.

172705073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196914.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 172705073 is about 13141.7302133319. The cubic root of 172705073 is about 556.8886478088. Note that the first 3 decimals are identical.

The spelling of 172705073 in words is "one hundred seventy-two million, seven hundred five thousand, seventy-three".