128667 has 16 divisors (see below), whose sum is σ = 214272. Its totient is φ = 66720.

The previous prime is 128663. The next prime is 128669. The reversal of 128667 is 766821.

It is a happy number.

It is not a de Polignac number, because 128667 - 2² = 128663 is a prime.

It is a nialpdrome in base 11.

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 15 ways as a sum of consecutive naturals, for example, 48 + ... + 509.

It is an arithmetic number, because the mean of its divisors is an integer number (13392).

2¹²⁸⁶⁶⁷ is an apocalyptic number.

128667 is a deficient number, since it is larger than the sum of its proper divisors (85605).

128667 is a wasteful number, since it uses less digits than its factorization.

128667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578.

The product of its digits is 4032, while the sum is 30.

The square root of 128667 is about 358.7018260338. The cubic root of 128667 is about 50.4842286469.

The spelling of 128667 in words is "one hundred twenty-eight thousand, six hundred sixty-seven".