2777728 has 16 divisors (see below), whose sum is σ = 5534010. Its totient is φ = 1388800.

The previous prime is 2777717. The next prime is 2777729. The reversal of 2777728 is 8277772.

2777728 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1871424 + 906304 = 1368^2 + 952^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (2777729) 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 as a sum of consecutive naturals, namely, 10723 + ... + 10978.

2^2777728 is an apocalyptic number.

It is an amenable number.

2777728 is a deficient number, since it is larger than the sum of its proper divisors (2756282).

2777728 is an equidigital number, since it uses as much as digits as its factorization.

2777728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21715 (or 21703 counting only the distinct ones).

The product of its digits is 76832, while the sum is 40.

The square root of 2777728 is about 1666.6517332664. The cubic root of 2777728 is about 140.5712711945.

The spelling of 2777728 in words is "two million, seven hundred seventy-seven thousand, seven hundred twenty-eight".