646006 has 4 divisors (see below), whose sum is σ = 969012. Its totient is φ = 323002.

The previous prime is 646003. The next prime is 646013. The reversal of 646006 is 600646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 600646 = 2 ⋅300323.

It is a plaindrome in base 8.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161500 + ... + 161503.

It is an arithmetic number, because the mean of its divisors is an integer number (242253).

2⁶⁴⁶⁰⁰⁶ is an apocalyptic number.

646006 is a deficient number, since it is larger than the sum of its proper divisors (323006).

646006 is a wasteful number, since it uses less digits than its factorization.

646006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323005.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 646006 is about 803.7449844323. The cubic root of 646006 is about 86.4461223509.

The spelling of 646006 in words is "six hundred forty-six thousand, six".