645452 has 6 divisors (see below), whose sum is σ = 1129548. Its totient is φ = 322724.

The previous prime is 645443. The next prime is 645467. The reversal of 645452 is 254546.

645452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

645452 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 as a sum of consecutive naturals, namely, 80678 + ... + 80685.

It is an arithmetic number, because the mean of its divisors is an integer number (188258).

2⁶⁴⁵⁴⁵² is an apocalyptic number.

It is an amenable number.

645452 is a deficient number, since it is larger than the sum of its proper divisors (484096).

645452 is a wasteful number, since it uses less digits than its factorization.

645452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161367 (or 161365 counting only the distinct ones).

The product of its digits is 4800, while the sum is 26.

The square root of 645452 is about 803.4002738361. The cubic root of 645452 is about 86.4214038764.

Adding to 645452 its reverse (254546), we get a palindrome (899998).

The spelling of 645452 in words is "six hundred forty-five thousand, four hundred fifty-two".