2780782 has 4 divisors (see below), whose sum is σ = 4171176. Its totient is φ = 1390390.

The previous prime is 2780779. The next prime is 2780797. The reversal of 2780782 is 2870872.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695194 + ... + 695197.

It is an arithmetic number, because the mean of its divisors is an integer number (1042794).

2^2780782 is an apocalyptic number.

2780782 is a deficient number, since it is larger than the sum of its proper divisors (1390394).

2780782 is a wasteful number, since it uses less digits than its factorization.

2780782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390393.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 2780782 is about 1667.5676897805. The cubic root of 2780782 is about 140.6227698083.

It can be divided in two parts, 27807 and 82, that added together give a square (27889 = 167²).

The spelling of 2780782 in words is "two million, seven hundred eighty thousand, seven hundred eighty-two".