128645 has 8 divisors (see below), whose sum is σ = 168480. Its totient is φ = 93520.

The previous prime is 128629. The next prime is 128657. The reversal of 128645 is 546821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128645 - 2⁴ = 128629 is a prime.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1115 + ... + 1224.

It is an arithmetic number, because the mean of its divisors is an integer number (21060).

2¹²⁸⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

128645 is a deficient number, since it is larger than the sum of its proper divisors (39835).

128645 is a wasteful number, since it uses less digits than its factorization.

128645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355.

The product of its digits is 1920, while the sum is 26.

The square root of 128645 is about 358.6711585840. The cubic root of 128645 is about 50.4813511509.

It can be divided in two parts, 1286 and 45, that added together give a palindrome (1331).

The spelling of 128645 in words is "one hundred twenty-eight thousand, six hundred forty-five".