646811 has 8 divisors (see below), whose sum is σ = 712704. Its totient is φ = 582120.

The previous prime is 646781. The next prime is 646823. The reversal of 646811 is 118646.

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

It is not a de Polignac number, because 646811 - 2¹⁰ = 645787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646831) 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 7 ways as a sum of consecutive naturals, for example, 1166 + ... + 1628.

It is an arithmetic number, because the mean of its divisors is an integer number (89088).

2⁶⁴⁶⁸¹¹ is an apocalyptic number.

646811 is a deficient number, since it is larger than the sum of its proper divisors (65893).

646811 is a wasteful number, since it uses less digits than its factorization.

646811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601.

The product of its digits is 1152, while the sum is 26.

The square root of 646811 is about 804.2456092513. The cubic root of 646811 is about 86.4820148158.

The spelling of 646811 in words is "six hundred forty-six thousand, eight hundred eleven".