2781040 has 20 divisors (see below), whose sum is σ = 6466104. Its totient is φ = 1112384.

The previous prime is 2781029. The next prime is 2781059. The reversal of 2781040 is 401872.

2781040 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17302 + ... + 17461.

2^2781040 is an apocalyptic number.

2781040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2781040 is an abundant number, since it is smaller than the sum of its proper divisors (3685064).

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

2781040 is a wasteful number, since it uses less digits than its factorization.

2781040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34776 (or 34770 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 2781040 is about 1667.6450461654. The cubic root of 2781040 is about 140.6271186512.

The spelling of 2781040 in words is "two million, seven hundred eighty-one thousand, forty".