128664 has 24 divisors (see below), whose sum is σ = 348660. Its totient is φ = 42864.

The previous prime is 128663. The next prime is 128669. The reversal of 128664 is 466821.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

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 5 ways as a sum of consecutive naturals, for example, 822 + ... + 965.

2^{128664} is an apocalyptic number.

It is an amenable number.

128664 is an abundant number, since it is smaller than the sum of its proper divisors (219996).

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

128664 is a wasteful number, since it uses less digits than its factorization.

128664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799 (or 1792 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 128664 is about 358.6976442632. The cubic root of 128664 is about 50.4838362804.

The spelling of 128664 in words is "one hundred twenty-eight thousand, six hundred sixty-four".

Divisors: 1 2 3 4 6 8 9 12 18 24 36 72 1787 3574 5361 7148 10722 14296 16083 21444 32166 42888 64332 128664

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