2781568 has 32 divisors (see below), whose sum is σ = 5728320. Its totient is φ = 1344000.

The previous prime is 2781521. The next prime is 2781577. The reversal of 2781568 is 8651872.

It is a tau number, because it is divible by the number of its divisors (32).

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, 3618 + ... + 4318.

It is an arithmetic number, because the mean of its divisors is an integer number (179010).

2^2781568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2781568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2864160).

2781568 is an abundant number, since it is smaller than the sum of its proper divisors (2946752).

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

2781568 is an equidigital number, since it uses as much as digits as its factorization.

2781568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 734 counting only the distinct ones).

The product of its digits is 26880, while the sum is 37.

The square root of 2781568 is about 1667.8033457216. The cubic root of 2781568 is about 140.6360177705.

The spelling of 2781568 in words is "two million, seven hundred eighty-one thousand, five hundred sixty-eight".