646836 has 24 divisors (see below), whose sum is σ = 1589280. Its totient is φ = 204192.

The previous prime is 646831. The next prime is 646837. The reversal of 646836 is 638646.

It is a junction number, because it is equal to n+sod(n) for n = 646797 and 646806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646831) by changing a digit.

646836 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1191 + ... + 1646.

It is an arithmetic number, because the mean of its divisors is an integer number (66220).

2⁶⁴⁶⁸³⁶ is an apocalyptic number.

It is an amenable number.

646836 is an abundant number, since it is smaller than the sum of its proper divisors (942444).

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

646836 is a wasteful number, since it uses less digits than its factorization.

646836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863 (or 2861 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 646836 is about 804.2611516168. The cubic root of 646836 is about 86.4831290117.

The spelling of 646836 in words is "six hundred forty-six thousand, eight hundred thirty-six".