646522 has 8 divisors (see below), whose sum is σ = 986400. Its totient is φ = 317724.

The previous prime is 646519. The next prime is 646523. The reversal of 646522 is 225646.

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

It is not an unprimeable number, because it can be changed into a prime (646523) 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 in 3 ways as a sum of consecutive naturals, for example, 2622 + ... + 2857.

It is an arithmetic number, because the mean of its divisors is an integer number (123300).

2⁶⁴⁶⁵²² is an apocalyptic number.

646522 is a deficient number, since it is larger than the sum of its proper divisors (339878).

646522 is a wasteful number, since it uses less digits than its factorization.

646522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5540.

The product of its digits is 2880, while the sum is 25.

The square root of 646522 is about 804.0659176958. The cubic root of 646522 is about 86.4691326263.

The spelling of 646522 in words is "six hundred forty-six thousand, five hundred twenty-two".