12420110728 has 8 divisors (see below), whose sum is σ = 23287707630. Its totient is φ = 6210055360.

The previous prime is 12420110671. The next prime is 12420110737. The reversal of 12420110728 is 82701102421.

It can be written as a sum of positive squares in only one way, i.e., 6932560644 + 5487550084 = 83262^2 + 74078^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 12420110696 and 12420110705.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776256913 + ... + 776256928.

Almost surely, 2^12420110728 is an apocalyptic number.

It is an amenable number.

12420110728 is a deficient number, since it is larger than the sum of its proper divisors (10867596902).

12420110728 is a wasteful number, since it uses less digits than its factorization.

12420110728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552513847 (or 1552513843 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The spelling of 12420110728 in words is "twelve billion, four hundred twenty million, one hundred ten thousand, seven hundred twenty-eight".