646830 has 24 divisors (see below), whose sum is σ = 1681992. Its totient is φ = 172464.

The previous prime is 646823. The next prime is 646831. The reversal of 646830 is 38646.

It is a junction number, because it is equal to n+sod(n) for n = 646794 and 646803.

It is a congruent number.

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

646830 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 (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3504 + ... + 3683.

It is an arithmetic number, because the mean of its divisors is an integer number (70083).

2⁶⁴⁶⁸³⁰ is an apocalyptic number.

646830 is an abundant number, since it is smaller than the sum of its proper divisors (1035162).

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

646830 is a wasteful number, since it uses less digits than its factorization.

646830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7200 (or 7197 counting only the distinct ones).

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

The square root of 646830 is about 804.2574214765. The cubic root of 646830 is about 86.4828616073.

The spelling of 646830 in words is "six hundred forty-six thousand, eight hundred thirty".