2780920 has 32 divisors (see below), whose sum is σ = 6429600. Its totient is φ = 1081728.

The previous prime is 2780909. The next prime is 2780923. The reversal of 2780920 is 290872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541 + ... + 2419.

It is an arithmetic number, because the mean of its divisors is an integer number (200925).

2^2780920 is an apocalyptic number.

2780920 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 2780920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3214800).

2780920 is an abundant number, since it is smaller than the sum of its proper divisors (3648680).

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

2780920 is a wasteful number, since it uses less digits than its factorization.

2780920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927 (or 1923 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 2780920 is about 1667.6090668979. The cubic root of 2780920 is about 140.6250959670.

The spelling of 2780920 in words is "two million, seven hundred eighty thousand, nine hundred twenty".