13128687 has 36 divisors (see below), whose sum is σ = 22501752. Its totient is φ = 7272000.

The previous prime is 13128667. The next prime is 13128701. The reversal of 13128687 is 78682131.

It is not a de Polignac number, because 13128687 - 2⁶ = 13128623 is a prime.

Its product of digits (16128) is a multiple of the sum of its prime divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13128617) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 129937 + ... + 130037.

Almost surely, 2^13128687 is an apocalyptic number.

13128687 is a deficient number, since it is larger than the sum of its proper divisors (9373065).

13128687 is a wasteful number, since it uses less digits than its factorization.

13128687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 128 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 13128687 is about 3623.3530051597. The cubic root of 13128687 is about 235.9067847418.

It can be divided in two parts, 1312 and 8687, that added together give a palindrome (9999).

The spelling of 13128687 in words is "thirteen million, one hundred twenty-eight thousand, six hundred eighty-seven".