646064 has 20 divisors (see below), whose sum is σ = 1264800. Its totient is φ = 319680.

The previous prime is 646039. The next prime is 646067. The reversal of 646064 is 460646.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646064.

It is not an unprimeable number, because it can be changed into a prime (646067) by changing a digit.

646064 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 2249 + ... + 2519.

It is an arithmetic number, because the mean of its divisors is an integer number (63240).

2⁶⁴⁶⁰⁶⁴ is an apocalyptic number.

It is an amenable number.

646064 is a deficient number, since it is larger than the sum of its proper divisors (618736).

646064 is a wasteful number, since it uses less digits than its factorization.

646064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 646064 is about 803.7810647185. The cubic root of 646064 is about 86.4487093883.

The spelling of 646064 in words is "six hundred forty-six thousand, sixty-four".