12728698432 has 14 divisors (see below), whose sum is σ = 25258511078. Its totient is φ = 6364349184.

The previous prime is 12728698427. The next prime is 12728698441. The reversal of 12728698432 is 23489682721.

It can be written as a sum of positive squares in only one way, i.e., 12567306816 + 161391616 = 112104^2 + 12704^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12728698432.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99442893 + ... + 99443020.

Almost surely, 2^12728698432 is an apocalyptic number.

It is an amenable number.

12728698432 is a deficient number, since it is larger than the sum of its proper divisors (12529812646).

12728698432 is an equidigital number, since it uses as much as digits as its factorization.

12728698432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198885925 (or 198885915 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The spelling of 12728698432 in words is "twelve billion, seven hundred twenty-eight million, six hundred ninety-eight thousand, four hundred thirty-two".