2180728 has 16 divisors (see below), whose sum is σ = 4460760. Its totient is φ = 991200.

The previous prime is 2180723. The next prime is 2180741. The reversal of 2180728 is 8270812.

It is a junction number, because it is equal to n+sod(n) for n = 2180696 and 2180705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12303 + ... + 12478.

2^2180728 is an apocalyptic number.

It is an amenable number.

2180728 is an abundant number, since it is smaller than the sum of its proper divisors (2280032).

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

2180728 is a wasteful number, since it uses less digits than its factorization.

2180728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24798 (or 24794 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 2180728 is about 1476.7288173527. The cubic root of 2180728 is about 129.6782576178.

The spelling of 2180728 in words is "two million, one hundred eighty thousand, seven hundred twenty-eight".