13028937728 has 26 divisors (see below), whose sum is σ = 26054702754. Its totient is φ = 6514466816.

The previous prime is 13028937721. The next prime is 13028937739. The reversal of 13028937728 is 82773982031.

It can be written as a sum of positive squares in only one way, i.e., 11865309184 + 1163628544 = 108928^2 + 34112^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13028937721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1586351 + ... + 1594542.

Almost surely, 2^13028937728 is an apocalyptic number.

It is an amenable number.

13028937728 is a deficient number, since it is larger than the sum of its proper divisors (13025765026).

13028937728 is an frugal number, since it uses more digits than its factorization.

13028937728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3180917 (or 3180895 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 13028937728 in words is "thirteen billion, twenty-eight million, nine hundred thirty-seven thousand, seven hundred twenty-eight".