2728239885 has 36 divisors (see below), whose sum is σ = 5501026908. Its totient is φ = 1247194368.

The previous prime is 2728239863. The next prime is 2728239889. The reversal of 2728239885 is 5889328272.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 712409481 + 2015830404 = 26691^2 + 44898^2 .

It is not a de Polignac number, because 2728239885 - 2⁵ = 2728239853 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2728239889) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 616444 + ... + 620853.

It is an arithmetic number, because the mean of its divisors is an integer number (152806303).

Almost surely, 2^2728239885 is an apocalyptic number.

It is an amenable number.

2728239885 is an abundant number, since it is smaller than the sum of its proper divisors (2772787023).

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

2728239885 is a wasteful number, since it uses less digits than its factorization.

2728239885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237322 (or 1237312 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The square root of 2728239885 is about 52232.5557961699. Note that the first 3 decimals coincide. The cubic root of 2728239885 is about 1397.3145604945.

The spelling of 2728239885 in words is "two billion, seven hundred twenty-eight million, two hundred thirty-nine thousand, eight hundred eighty-five".