646289 has 8 divisors (see below), whose sum is σ = 782208. Its totient is φ = 521280.

The previous prime is 646273. The next prime is 646291. The reversal of 646289 is 982646.

646289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 646289 - 2⁴ = 646273 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646259) 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, 2597 + ... + 2834.

It is an arithmetic number, because the mean of its divisors is an integer number (97776).

2⁶⁴⁶²⁸⁹ is an apocalyptic number.

It is an amenable number.

646289 is a deficient number, since it is larger than the sum of its proper divisors (135919).

646289 is a wasteful number, since it uses less digits than its factorization.

646289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5455.

The product of its digits is 20736, while the sum is 35.

The square root of 646289 is about 803.9210160209. The cubic root of 646289 is about 86.4587438441.

The spelling of 646289 in words is "six hundred forty-six thousand, two hundred eighty-nine".