643532 has 6 divisors (see below), whose sum is σ = 1126188. Its totient is φ = 321764.

The previous prime is 643523. The next prime is 643547. The reversal of 643532 is 235346.

643532 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 643498 and 643507.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80438 + ... + 80445.

It is an arithmetic number, because the mean of its divisors is an integer number (187698).

2⁶⁴³⁵³² is an apocalyptic number.

It is an amenable number.

643532 is a deficient number, since it is larger than the sum of its proper divisors (482656).

643532 is a wasteful number, since it uses less digits than its factorization.

643532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160887 (or 160885 counting only the distinct ones).

The product of its digits is 2160, while the sum is 23.

The square root of 643532 is about 802.2044627151. The cubic root of 643532 is about 86.3356273480.

Adding to 643532 its reverse (235346), we get a palindrome (878878).

The spelling of 643532 in words is "six hundred forty-three thousand, five hundred thirty-two".