172730228 has 24 divisors (see below), whose sum is σ = 333165504. Its totient is φ = 77702400.

The previous prime is 172730213. The next prime is 172730267. The reversal of 172730228 is 822037271.

It is a junction number, because it is equal to n+sod(n) for n = 172730194 and 172730203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15968 + ... + 24503.

It is an arithmetic number, because the mean of its divisors is an integer number (13881896).

Almost surely, 2^172730228 is an apocalyptic number.

It is an amenable number.

172730228 is a deficient number, since it is larger than the sum of its proper divisors (160435276).

172730228 is a wasteful number, since it uses less digits than its factorization.

172730228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40583 (or 40581 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 172730228 is about 13142.6872442435. The cubic root of 172730228 is about 556.9156839841.

Adding to 172730228 its reverse (822037271), we get a palindrome (994767499).

The spelling of 172730228 in words is "one hundred seventy-two million, seven hundred thirty thousand, two hundred twenty-eight".