645352 has 8 divisors (see below), whose sum is σ = 1210050. Its totient is φ = 322672.

The previous prime is 645347. The next prime is 645353. The reversal of 645352 is 253546.

645352 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 617796 + 27556 = 786^2 + 166^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (645353) by changing a digit.

645352 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, 40327 + ... + 40342.

2⁶⁴⁵³⁵² is an apocalyptic number.

It is an amenable number.

645352 is a deficient number, since it is larger than the sum of its proper divisors (564698).

645352 is a wasteful number, since it uses less digits than its factorization.

645352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80675 (or 80671 counting only the distinct ones).

The product of its digits is 3600, while the sum is 25.

The square root of 645352 is about 803.3380359475. The cubic root of 645352 is about 86.4169405511.

Adding to 645352 its reverse (253546), we get a palindrome (898898).

The spelling of 645352 in words is "six hundred forty-five thousand, three hundred fifty-two".