2028780 has 144 divisors (see below), whose sum is σ = 7220640. Its totient is φ = 470016.

The previous prime is 2028779. The next prime is 2028781. The reversal of 2028780 is 878202.

It is an interprime number because it is at equal distance from previous prime (2028779) and next prime (2028781).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2028781) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119332 + ... + 119348.

2^2028780 is an apocalyptic number.

2028780 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 2028780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3610320).

2028780 is an abundant number, since it is smaller than the sum of its proper divisors (5191860).

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

2028780 is a wasteful number, since it uses less digits than its factorization.

2028780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 2028780 is about 1424.3524844644. The cubic root of 2028780 is about 126.5935712465.

The spelling of 2028780 in words is "two million, twenty-eight thousand, seven hundred eighty".