2728949 has 4 divisors (see below), whose sum is σ = 2732364. Its totient is φ = 2725536.

The previous prime is 2728939. The next prime is 2728967. The reversal of 2728949 is 9498272.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 819025 + 1909924 = 905^2 + 1382^2 .

It is a cyclic number.

It is not a de Polignac number, because 2728949 - 2⁴ = 2728933 is a prime.

It is a d-powerful number, because it can be written as 2¹³ + 7³ + 2²¹ + 8⁵ + 9⁵ + 4 + 9⁶ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2728939) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 209 + ... + 2345.

It is an arithmetic number, because the mean of its divisors is an integer number (683091).

2^2728949 is an apocalyptic number.

It is an amenable number.

2728949 is a deficient number, since it is larger than the sum of its proper divisors (3415).

2728949 is a wasteful number, since it uses less digits than its factorization.

2728949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3414.

The product of its digits is 72576, while the sum is 41.

The square root of 2728949 is about 1651.9530865009. The cubic root of 2728949 is about 139.7435611785.

The spelling of 2728949 in words is "two million, seven hundred twenty-eight thousand, nine hundred forty-nine".