2781564 has 24 divisors (see below), whose sum is σ = 6714960. Its totient is φ = 895104.

The previous prime is 2781521. The next prime is 2781577. The reversal of 2781564 is 4651872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3649 + ... + 4344.

It is an arithmetic number, because the mean of its divisors is an integer number (279790).

2^2781564 is an apocalyptic number.

It is an amenable number.

2781564 is an abundant number, since it is smaller than the sum of its proper divisors (3933396).

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

2781564 is a wasteful number, since it uses less digits than its factorization.

2781564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8029 (or 8027 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 2781564 is about 1667.8021465390. The cubic root of 2781564 is about 140.6359503572.

The spelling of 2781564 in words is "two million, seven hundred eighty-one thousand, five hundred sixty-four".