643020006 has 16 divisors (see below), whose sum is σ = 1287500544. Its totient is φ = 214096584.

The previous prime is 643019999. The next prime is 643020013. The reversal of 643020006 is 600020346.

It is an interprime number because it is at equal distance from previous prime (643019999) and next prime (643020013).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55090 + ... + 65733.

It is an arithmetic number, because the mean of its divisors is an integer number (80468784).

Almost surely, 2^643020006 is an apocalyptic number.

643020006 is an abundant number, since it is smaller than the sum of its proper divisors (644480538).

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

643020006 is a wasteful number, since it uses less digits than its factorization.

643020006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121715.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 643020006 is about 25357.8391429554. The cubic root of 643020006 is about 863.1272506755.

The spelling of 643020006 in words is "six hundred forty-three million, twenty thousand, six".