2180780 has 48 divisors (see below), whose sum is σ = 5388096. Its totient is φ = 725760.

The previous prime is 2180747. The next prime is 2180797. The reversal of 2180780 is 870812.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4970 + ... + 5390.

It is an arithmetic number, because the mean of its divisors is an integer number (112252).

2^2180780 is an apocalyptic number.

2180780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2180780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2694048).

2180780 is an abundant number, since it is smaller than the sum of its proper divisors (3207316).

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

2180780 is a wasteful number, since it uses less digits than its factorization.

2180780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 2180780 is about 1476.7464237302. The cubic root of 2180780 is about 129.6792883464.

The spelling of 2180780 in words is "two million, one hundred eighty thousand, seven hundred eighty".