2728137728 has 22 divisors (see below), whose sum is σ = 5453613306. Its totient is φ = 1364068352.

The previous prime is 2728137721. The next prime is 2728137739. The reversal of 2728137728 is 8277318272.

It can be written as a sum of positive squares in only one way, i.e., 1981318144 + 746819584 = 44512^2 + 27328^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2728137721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1331075 + ... + 1333122.

Almost surely, 2^2728137728 is an apocalyptic number.

It is an amenable number.

2728137728 is a deficient number, since it is larger than the sum of its proper divisors (2725475578).

2728137728 is an equidigital number, since it uses as much as digits as its factorization.

2728137728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664217 (or 2664199 counting only the distinct ones).

The product of its digits is 526848, while the sum is 47.

The square root of 2728137728 is about 52231.5778815842. The cubic root of 2728137728 is about 1397.2971197939.

The spelling of 2728137728 in words is "two billion, seven hundred twenty-eight million, one hundred thirty-seven thousand, seven hundred twenty-eight".