643354005 has 32 divisors (see below), whose sum is σ = 1214373888. Its totient is φ = 284616000.

The previous prime is 643353989. The next prime is 643354021. The reversal of 643354005 is 500453346.

643354005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643353989) and next prime (643354021).

It is not a de Polignac number, because 643354005 - 2⁴ = 643353989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95571 + ... + 102080.

It is an arithmetic number, because the mean of its divisors is an integer number (37949184).

Almost surely, 2^643354005 is an apocalyptic number.

It is an amenable number.

643354005 is a deficient number, since it is larger than the sum of its proper divisors (571019883).

643354005 is a wasteful number, since it uses less digits than its factorization.

643354005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197697.

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 643354005 is about 25364.4240029219. The cubic root of 643354005 is about 863.2766673534.

The spelling of 643354005 in words is "six hundred forty-three million, three hundred fifty-four thousand, five".