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172228 = 2276151
BaseRepresentation
bin101010000011000100
322202020211
4222003010
521002403
63405204
71315060
oct520304
9282224
10172228
11108441
1283804
1360514
1446aa0
153606d
hex2a0c4

172228 has 12 divisors (see below), whose sum is σ = 344512. Its totient is φ = 73800.

The previous prime is 172223. The next prime is 172243. The reversal of 172228 is 822271.

172228 is an admirable number.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 172199 and 172208.

It is not an unprimeable number, because it can be changed into a prime (172223) 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, 3048 + ... + 3103.

2172228 is an apocalyptic number.

It is an amenable number.

172228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172228 is a wasteful number, since it uses less digits than its factorization.

172228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6162 (or 6160 counting only the distinct ones).

The product of its digits is 448, while the sum is 22.

The square root of 172228 is about 415.0036144421. The cubic root of 172228 is about 55.6375399915.

Adding to 172228 its reverse (822271), we get a palindrome (994499).

It can be divided in two parts, 172 and 228, that added together give a square (400 = 202).

The spelling of 172228 in words is "one hundred seventy-two thousand, two hundred twenty-eight".

Divisors: 1 2 4 7 14 28 6151 12302 24604 43057 86114 172228