646452 has 18 divisors (see below), whose sum is σ = 1634178. Its totient is φ = 215472.

The previous prime is 646433. The next prime is 646453. The reversal of 646452 is 254646.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 646416 + 36 = 804^2 + 6^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646453) by changing a digit.

646452 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 5 ways as a sum of consecutive naturals, for example, 8943 + ... + 9014.

2⁶⁴⁶⁴⁵² is an apocalyptic number.

It is an amenable number.

646452 is an abundant number, since it is smaller than the sum of its proper divisors (987726).

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

646452 is a wasteful number, since it uses less digits than its factorization.

646452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17967 (or 17962 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 646452 is about 804.0223877480. The cubic root of 646452 is about 86.4660117953.

The spelling of 646452 in words is "six hundred forty-six thousand, four hundred fifty-two".