172828 has 6 divisors (see below), whose sum is σ = 302456. Its totient is φ = 86412.

The previous prime is 172807. The next prime is 172829. The reversal of 172828 is 828271.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 172796 and 172805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21600 + ... + 21607.

2¹⁷²⁸²⁸ is an apocalyptic number.

It is an amenable number.

172828 is a deficient number, since it is larger than the sum of its proper divisors (129628).

172828 is a wasteful number, since it uses less digits than its factorization.

172828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43211 (or 43209 counting only the distinct ones).

The product of its digits is 1792, while the sum is 28.

The square root of 172828 is about 415.7258712180. The cubic root of 172828 is about 55.7020742781.

It can be divided in two parts, 1728 and 28, that multiplied together give a palindrome (48384).

The spelling of 172828 in words is "one hundred seventy-two thousand, eight hundred twenty-eight".