2781248 has 14 divisors (see below), whose sum is σ = 5519166. Its totient is φ = 1390592.

The previous prime is 2781221. The next prime is 2781271. The reversal of 2781248 is 8421872.

It can be written as a sum of positive squares in only one way, i.e., 2458624 + 322624 = 1568^2 + 568^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an Ulam number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 21665 + ... + 21792.

2^2781248 is an apocalyptic number.

It is an amenable number.

2781248 is a deficient number, since it is larger than the sum of its proper divisors (2737918).

2781248 is an equidigital number, since it uses as much as digits as its factorization.

2781248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43469 (or 43459 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 2781248 is about 1667.7074083903. The cubic root of 2781248 is about 140.6306244993.

The spelling of 2781248 in words is "two million, seven hundred eighty-one thousand, two hundred forty-eight".