646022 has 8 divisors (see below), whose sum is σ = 1043616. Its totient is φ = 298152.

The previous prime is 646013. The next prime is 646027. The reversal of 646022 is 220646.

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

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 645985 and 646003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12398 + ... + 12449.

It is an arithmetic number, because the mean of its divisors is an integer number (130452).

2⁶⁴⁶⁰²² is an apocalyptic number.

646022 is a deficient number, since it is larger than the sum of its proper divisors (397594).

646022 is a wasteful number, since it uses less digits than its factorization.

646022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24862.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 646022 is about 803.7549377764. The cubic root of 646022 is about 86.4468360318.

Adding to 646022 its reverse (220646), we get a palindrome (866668).

The spelling of 646022 in words is "six hundred forty-six thousand, twenty-two".