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7220 = 225192
BaseRepresentation
bin1110000110100
3100220102
41300310
5212340
653232
730023
oct16064
910812
107220
115474
124218
133395
1428ba
152215
hex1c34

7220 has 18 divisors (see below), whose sum is σ = 16002. Its totient is φ = 2736.

The previous prime is 7219. The next prime is 7229. The reversal of 7220 is 227.

Adding to 7220 its reverse (227), we get a palindrome (7447).

It can be divided in two parts, 7 and 220, that multiplied together give a triangular number (1540 = T55).

It can be written as a sum of positive squares in only one way, i.e., 5776 + 1444 = 76^2 + 38^2 .

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 371 + ... + 389.

It is an arithmetic number, because the mean of its divisors is an integer number (889).

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8001).

7220 is an abundant number, since it is smaller than the sum of its proper divisors (8782).

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

7220 is a wasteful number, since it uses less digits than its factorization.

7220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47 (or 26 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 11.

The square root of 7220 is about 84.9705831450. The cubic root of 7220 is about 19.3276505956.

The spelling of 7220 in words is "seven thousand, two hundred twenty", and thus it is an iban number.

Divisors: 1 2 4 5 10 19 20 38 76 95 190 361 380 722 1444 1805 3610 7220