641646 has 24 divisors (see below), whose sum is σ = 1424280. Its totient is φ = 208656.

The previous prime is 641639. The next prime is 641681. The reversal of 641646 is 646146.

It is a congruent number.

It is an unprimeable number.

641646 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 11 ways as a sum of consecutive naturals, for example, 360 + ... + 1188.

It is an arithmetic number, because the mean of its divisors is an integer number (59345).

2⁶⁴¹⁶⁴⁶ is an apocalyptic number.

641646 is an abundant number, since it is smaller than the sum of its proper divisors (782634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641646 is a wasteful number, since it uses less digits than its factorization.

641646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880 (or 877 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 641646 is about 801.0280893951. The cubic root of 641646 is about 86.2512035119.

The spelling of 641646 in words is "six hundred forty-one thousand, six hundred forty-six".