646410 has 32 divisors (see below), whose sum is σ = 1607040. Its totient is φ = 166208.

The previous prime is 646403. The next prime is 646411. The reversal of 646410 is 14646.

646410 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (646411) by changing a digit.

646410 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 15 ways as a sum of consecutive naturals, for example, 499 + ... + 1241.

It is an arithmetic number, because the mean of its divisors is an integer number (50220).

2⁶⁴⁶⁴¹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (803520).

646410 is an abundant number, since it is smaller than the sum of its proper divisors (960630).

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

646410 is a wasteful number, since it uses less digits than its factorization.

646410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 646410 is about 803.9962686481. The cubic root of 646410 is about 86.4641391885.

The spelling of 646410 in words is "six hundred forty-six thousand, four hundred ten".