1728228 has 24 divisors (see below), whose sum is σ = 4102560. Its totient is φ = 566080.

The previous prime is 1728193. The next prime is 1728229. The reversal of 1728228 is 8228271.

It is a happy number.

It is a hoax number, since the sum of its digits (30) 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 = 1728195 and 1728204.

It is not an unprimeable number, because it can be changed into a prime (1728229) 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, 513 + ... + 1928.

It is an arithmetic number, because the mean of its divisors is an integer number (170940).

2^1728228 is an apocalyptic number.

It is an amenable number.

1728228 is an abundant number, since it is smaller than the sum of its proper divisors (2374332).

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

1728228 is a wasteful number, since it uses less digits than its factorization.

1728228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507 (or 2505 counting only the distinct ones).

The product of its digits is 3584, while the sum is 30.

The square root of 1728228 is about 1314.6208578902. The cubic root of 1728228 is about 120.0052775457.

The spelling of 1728228 in words is "one million, seven hundred twenty-eight thousand, two hundred twenty-eight".