643008850 has 48 divisors (see below), whose sum is σ = 1381491936. Its totient is φ = 220064000.

The previous prime is 643008827. The next prime is 643008853. The reversal of 643008850 is 58800346.

643008850 = 146² + 147² + ... + 1245².

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (643008853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25036 + ... + 43735.

It is an arithmetic number, because the mean of its divisors is an integer number (28781082).

Almost surely, 2^643008850 is an apocalyptic number.

643008850 is an abundant number, since it is smaller than the sum of its proper divisors (738483086).

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

643008850 is a wasteful number, since it uses less digits than its factorization.

643008850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68811 (or 68806 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 643008850 is about 25357.6191705767. The cubic root of 643008850 is about 863.1222590717.

The spelling of 643008850 in words is "six hundred forty-three million, eight thousand, eight hundred fifty".