1720228 has 6 divisors (see below), whose sum is σ = 3010406. Its totient is φ = 860112.

The previous prime is 1720223. The next prime is 1720231. The reversal of 1720228 is 8220271.

It can be written as a sum of positive squares in only one way, i.e., 984064 + 736164 = 992^2 + 858^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1720199 and 1720208.

It is not an unprimeable number, because it can be changed into a prime (1720223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215025 + ... + 215032.

2^1720228 is an apocalyptic number.

It is an amenable number.

1720228 is a deficient number, since it is larger than the sum of its proper divisors (1290178).

1720228 is a wasteful number, since it uses less digits than its factorization.

1720228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430061 (or 430059 counting only the distinct ones).

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

The square root of 1720228 is about 1311.5746261651. The cubic root of 1720228 is about 119.8198221943.

Adding to 1720228 its reverse (8220271), we get a palindrome (9940499).

The spelling of 1720228 in words is "one million, seven hundred twenty thousand, two hundred twenty-eight".