172704813 has 32 divisors (see below), whose sum is σ = 256143360. Its totient is φ = 103057920.

The previous prime is 172704811. The next prime is 172704821. The reversal of 172704813 is 318407271.

It is a happy number.

It is not a de Polignac number, because 172704813 - 2¹ = 172704811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172704811) 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, 74845 + ... + 77117.

It is an arithmetic number, because the mean of its divisors is an integer number (8004480).

Almost surely, 2^172704813 is an apocalyptic number.

It is an amenable number.

172704813 is a deficient number, since it is larger than the sum of its proper divisors (83438547).

172704813 is a wasteful number, since it uses less digits than its factorization.

172704813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2369.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 172704813 is about 13141.7203211756. The cubic root of 172704813 is about 556.8883683515. Note that the first 3 decimals are identical.

The spelling of 172704813 in words is "one hundred seventy-two million, seven hundred four thousand, eight hundred thirteen".