643232 has 12 divisors (see below), whose sum is σ = 1266426. Its totient is φ = 321600.

The previous prime is 643231. The next prime is 643243. The reversal of 643232 is 232346.

It can be written as a sum of positive squares in only one way, i.e., 583696 + 59536 = 764^2 + 244^2 .

643232 is a modest number, since divided by 3232 gives 64 as remainder.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643232.

It is not an unprimeable number, because it can be changed into a prime (643231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10019 + ... + 10082.

2⁶⁴³²³² is an apocalyptic number.

It is an amenable number.

643232 is a deficient number, since it is larger than the sum of its proper divisors (623194).

643232 is a wasteful number, since it uses less digits than its factorization.

643232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20111 (or 20103 counting only the distinct ones).

The product of its digits is 864, while the sum is 20.

The square root of 643232 is about 802.0174561691. The cubic root of 643232 is about 86.3222093600.

Adding to 643232 its reverse (232346), we get a palindrome (875578).

The spelling of 643232 in words is "six hundred forty-three thousand, two hundred thirty-two".