128660 has 24 divisors (see below), whose sum is σ = 309120. Its totient is φ = 44064.

The previous prime is 128659. The next prime is 128663. The reversal of 128660 is 66821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320 + ... + 599.

It is an arithmetic number, because the mean of its divisors is an integer number (12880).

2¹²⁸⁶⁶⁰ is an apocalyptic number.

128660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128660 is an abundant number, since it is smaller than the sum of its proper divisors (180460).

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

128660 is a wasteful number, since it uses less digits than its factorization.

128660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 128660 is about 358.6920684933. The cubic root of 128660 is about 50.4833131156.

The spelling of 128660 in words is "one hundred twenty-eight thousand, six hundred sixty".