2728220 has 24 divisors (see below), whose sum is σ = 6250608. Its totient is φ = 992000.

The previous prime is 2728207. The next prime is 2728241. The reversal of 2728220 is 228272.

It is a happy number.

It is a super-3 number, since 3×2728220³ = 60919933372668744000, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5981 + ... + 6420.

It is an arithmetic number, because the mean of its divisors is an integer number (260442).

2^2728220 is an apocalyptic number.

2728220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2728220 is an abundant number, since it is smaller than the sum of its proper divisors (3522388).

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

2728220 is a wasteful number, since it uses less digits than its factorization.

2728220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12421 (or 12419 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 2728220 is about 1651.7324238508. The cubic root of 2728220 is about 139.7311165672.

The spelling of 2728220 in words is "two million, seven hundred twenty-eight thousand, two hundred twenty".