128013688 has 16 divisors (see below), whose sum is σ = 261846360. Its totient is φ = 58188000.

The previous prime is 128013679. The next prime is 128013701. The reversal of 128013688 is 886310821.

It is a super-2 number, since 2×128013688² = 32775008630722688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 727263 + ... + 727438.

Almost surely, 2^128013688 is an apocalyptic number.

It is an amenable number.

128013688 is an abundant number, since it is smaller than the sum of its proper divisors (133832672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128013688 is a wasteful number, since it uses less digits than its factorization.

128013688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454718 (or 1454714 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 128013688 is about 11314.3134126645. The cubic root of 128013688 is about 503.9863836919.

The spelling of 128013688 in words is "one hundred twenty-eight million, thirteen thousand, six hundred eighty-eight".