643510132 has 12 divisors (see below), whose sum is σ = 1127604996. Its totient is φ = 321337280.

The previous prime is 643510103. The next prime is 643510141. The reversal of 643510132 is 231015346.

It can be written as a sum of positive squares in 2 ways, for example, as 44435556 + 599074576 = 6666^2 + 24476^2 .

It is a junction number, because it is equal to n+sod(n) for n = 643510097 and 643510106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100969 + ... + 107152.

It is an arithmetic number, because the mean of its divisors is an integer number (93967083).

Almost surely, 2^643510132 is an apocalyptic number.

It is an amenable number.

643510132 is a deficient number, since it is larger than the sum of its proper divisors (484094864).

643510132 is a wasteful number, since it uses less digits than its factorization.

643510132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208898 (or 208896 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 643510132 is about 25367.5014930521. The cubic root of 643510132 is about 863.3464940708.

Adding to 643510132 its reverse (231015346), we get a palindrome (874525478).

The spelling of 643510132 in words is "six hundred forty-three million, five hundred ten thousand, one hundred thirty-two".