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172220 = 22579109
BaseRepresentation
bin101010000010111100
322202020112
4222002330
521002340
63405152
71315046
oct520274
9282215
10172220
11108434
12837b8
1360509
1446a96
1536065
hex2a0bc

172220 has 24 divisors (see below), whose sum is σ = 369600. Its totient is φ = 67392.

The previous prime is 172219. The next prime is 172223. The reversal of 172220 is 22271.

Adding to 172220 its reverse (22271), we get a palindrome (194491).

It is a junction number, because it is equal to n+sod(n) for n = 172195 and 172204.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1526 + ... + 1634.

It is an arithmetic number, because the mean of its divisors is an integer number (15400).

2172220 is an apocalyptic number.

172220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172220 is an abundant number, since it is smaller than the sum of its proper divisors (197380).

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

172220 is a wasteful number, since it uses less digits than its factorization.

172220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 172220 is about 414.9939758599. The cubic root of 172220 is about 55.6366785225.

The spelling of 172220 in words is "one hundred seventy-two thousand, two hundred twenty", and thus it is an iban number.

Divisors: 1 2 4 5 10 20 79 109 158 218 316 395 436 545 790 1090 1580 2180 8611 17222 34444 43055 86110 172220