2780540 has 24 divisors (see below), whose sum is σ = 6673632. Its totient is φ = 953280.

The previous prime is 2780527. The next prime is 2780597. The reversal of 2780540 is 450872.

2780540 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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, 9791 + ... + 10070.

It is an arithmetic number, because the mean of its divisors is an integer number (278068).

2^2780540 is an apocalyptic number.

2780540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2780540 is an abundant number, since it is smaller than the sum of its proper divisors (3893092).

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

2780540 is a wasteful number, since it uses less digits than its factorization.

2780540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19877 (or 19875 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 2780540 is about 1667.4951274292. The cubic root of 2780540 is about 140.6186904165.

The spelling of 2780540 in words is "two million, seven hundred eighty thousand, five hundred forty".