643463005 has 16 divisors (see below), whose sum is σ = 818700480. Its totient is φ = 483823872.

The previous prime is 643463003. The next prime is 643463017. The reversal of 643463005 is 500364346.

It is a cyclic number.

It is not a de Polignac number, because 643463005 - 2¹ = 643463003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643463003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62086 + ... + 71704.

It is an arithmetic number, because the mean of its divisors is an integer number (51168780).

Almost surely, 2^643463005 is an apocalyptic number.

It is an amenable number.

643463005 is a deficient number, since it is larger than the sum of its proper divisors (175237475).

643463005 is a wasteful number, since it uses less digits than its factorization.

643463005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10428.

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 643463005 is about 25366.5725907147. The cubic root of 643463005 is about 863.3254180372.

The spelling of 643463005 in words is "six hundred forty-three million, four hundred sixty-three thousand, five".