643213502 has 8 divisors (see below), whose sum is σ = 975661200. Its totient is φ = 317993104.

The previous prime is 643213421. The next prime is 643213507. The reversal of 643213502 is 205312346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643213507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806602 + ... + 1806957.

It is an arithmetic number, because the mean of its divisors is an integer number (121957650).

Almost surely, 2^643213502 is an apocalyptic number.

643213502 is a deficient number, since it is larger than the sum of its proper divisors (332447698).

643213502 is a wasteful number, since it uses less digits than its factorization.

643213502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3613650.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 643213502 is about 25361.6541652945. The cubic root of 643213502 is about 863.2138187032.

Adding to 643213502 its reverse (205312346), we get a palindrome (848525848).

The spelling of 643213502 in words is "six hundred forty-three million, two hundred thirteen thousand, five hundred two".