643606002 has 24 divisors (see below), whose sum is σ = 1501747884. Its totient is φ = 198032544.

The previous prime is 643605979. The next prime is 643606003. The reversal of 643606002 is 200606346.

It can be written as a sum of positive squares in 2 ways, for example, as 641558241 + 2047761 = 25329^2 + 1431^2 .

It is not an unprimeable number, because it can be changed into a prime (643606003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1374993 + ... + 1375460.

Almost surely, 2^643606002 is an apocalyptic number.

643606002 is an abundant number, since it is smaller than the sum of its proper divisors (858141882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643606002 is a wasteful number, since it uses less digits than its factorization.

643606002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750474 (or 2750471 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 643606002 is about 25369.3910451158. The cubic root of 643606002 is about 863.3893656664.

The spelling of 643606002 in words is "six hundred forty-three million, six hundred six thousand, two".