13387485128 has 8 divisors (see below), whose sum is σ = 25101534630. Its totient is φ = 6693742560.

The previous prime is 13387485121. The next prime is 13387485131. The reversal of 13387485128 is 82158478331.

It can be written as a sum of positive squares in only one way, i.e., 12422885764 + 964599364 = 111458^2 + 31058^2 .

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

It is not an unprimeable number, because it can be changed into a prime (13387485121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836717813 + ... + 836717828.

Almost surely, 2^13387485128 is an apocalyptic number.

It is an amenable number.

13387485128 is a deficient number, since it is larger than the sum of its proper divisors (11714049502).

13387485128 is a wasteful number, since it uses less digits than its factorization.

13387485128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673435647 (or 1673435643 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 50.

The spelling of 13387485128 in words is "thirteen billion, three hundred eighty-seven million, four hundred eighty-five thousand, one hundred twenty-eight".