646683 has 8 divisors (see below), whose sum is σ = 868368. Its totient is φ = 428064.

The previous prime is 646669. The next prime is 646687. The reversal of 646683 is 386646.

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

It is not a de Polignac number, because 646683 - 2⁶ = 646619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646687) 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, 216 + ... + 1157.

It is an arithmetic number, because the mean of its divisors is an integer number (108546).

2⁶⁴⁶⁶⁸³ is an apocalyptic number.

646683 is a deficient number, since it is larger than the sum of its proper divisors (221685).

646683 is a wasteful number, since it uses less digits than its factorization.

646683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533.

The product of its digits is 20736, while the sum is 33.

The square root of 646683 is about 804.1660276336. The cubic root of 646683 is about 86.4763096829.

The spelling of 646683 in words is "six hundred forty-six thousand, six hundred eighty-three".