172628399 has 4 divisors (see below), whose sum is σ = 172751136. Its totient is φ = 172505664.

The previous prime is 172628383. The next prime is 172628411. The reversal of 172628399 is 993826271.

It is a happy number.

172628399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993826271 = 641 ⋅1550431.

It is a cyclic number.

It is not a de Polignac number, because 172628399 - 2⁴ = 172628383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172628299) 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, 59234 + ... + 62079.

It is an arithmetic number, because the mean of its divisors is an integer number (43187784).

Almost surely, 2^172628399 is an apocalyptic number.

172628399 is a deficient number, since it is larger than the sum of its proper divisors (122737).

172628399 is a wasteful number, since it uses less digits than its factorization.

172628399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122736.

The product of its digits is 326592, while the sum is 47.

The square root of 172628399 is about 13138.8126936950. The cubic root of 172628399 is about 556.8062236703.

The spelling of 172628399 in words is "one hundred seventy-two million, six hundred twenty-eight thousand, three hundred ninety-nine".