128013687 has 6 divisors (see below), whose sum is σ = 184908672. Its totient is φ = 85342452.

The previous prime is 128013679. The next prime is 128013701. The reversal of 128013687 is 786310821.

It is not a de Polignac number, because 128013687 - 2³ = 128013679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128013647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7111863 + ... + 7111880.

It is an arithmetic number, because the mean of its divisors is an integer number (30818112).

Almost surely, 2^128013687 is an apocalyptic number.

128013687 is a deficient number, since it is larger than the sum of its proper divisors (56894985).

128013687 is a wasteful number, since it uses less digits than its factorization.

128013687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14223749 (or 14223746 counting only the distinct ones).

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

The square root of 128013687 is about 11314.3133684727. The cubic root of 128013687 is about 503.9863823796.

The spelling of 128013687 in words is "one hundred twenty-eight million, thirteen thousand, six hundred eighty-seven".