2781312 has 32 divisors (see below), whose sum is σ = 7388880. Its totient is φ = 926976.

The previous prime is 2781307. The next prime is 2781313. The reversal of 2781312 is 2131872.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (2781313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3238 + ... + 4005.

2^2781312 is an apocalyptic number.

It is an amenable number.

2781312 is an abundant number, since it is smaller than the sum of its proper divisors (4607568).

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

2781312 is an equidigital number, since it uses as much as digits as its factorization.

2781312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7260 (or 7248 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 2781312 is about 1667.7265962981. The cubic root of 2781312 is about 140.6317031866.

The spelling of 2781312 in words is "two million, seven hundred eighty-one thousand, three hundred twelve".