2128780 has 24 divisors (see below), whose sum is σ = 4504752. Its totient is φ = 844992.

The previous prime is 2128769. The next prime is 2128781. The reversal of 2128780 is 878212.

It is not an unprimeable number, because it can be changed into a prime (2128781) 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, 2934 + ... + 3586.

It is an arithmetic number, because the mean of its divisors is an integer number (187698).

2^2128780 is an apocalyptic number.

2128780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2128780 is an abundant number, since it is smaller than the sum of its proper divisors (2375972).

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

2128780 is a wasteful number, since it uses less digits than its factorization.

2128780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 823 counting only the distinct ones).

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

The square root of 2128780 is about 1459.0339269530. The cubic root of 2128780 is about 128.6402653136.

The spelling of 2128780 in words is "two million, one hundred twenty-eight thousand, seven hundred eighty".