172228723 has 4 divisors (see below), whose sum is σ = 172255248. Its totient is φ = 172202200.

The previous prime is 172228697. The next prime is 172228733. The reversal of 172228723 is 327822271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 172228723 - 2⁵ = 172228691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172228733) 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, 3765 + ... + 18937.

It is an arithmetic number, because the mean of its divisors is an integer number (43063812).

Almost surely, 2^172228723 is an apocalyptic number.

172228723 is a deficient number, since it is larger than the sum of its proper divisors (26525).

172228723 is a wasteful number, since it uses less digits than its factorization.

172228723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26524.

The product of its digits is 18816, while the sum is 34.

The square root of 172228723 is about 13123.5941342301. The cubic root of 172228723 is about 556.3761784540.

The spelling of 172228723 in words is "one hundred seventy-two million, two hundred twenty-eight thousand, seven hundred twenty-three".