643143450 has 24 divisors (see below), whose sum is σ = 1594996128. Its totient is φ = 171504880.

The previous prime is 643143443. The next prime is 643143461. The reversal of 643143450 is 54341346.

643143450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2143662 + ... + 2143961.

It is an arithmetic number, because the mean of its divisors is an integer number (66458172).

Almost surely, 2^643143450 is an apocalyptic number.

643143450 is an abundant number, since it is smaller than the sum of its proper divisors (951852678).

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

643143450 is a wasteful number, since it uses less digits than its factorization.

643143450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4287638 (or 4287633 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 643143450 is about 25360.2730663532. The cubic root of 643143450 is about 863.1824801976.

Adding to 643143450 its reverse (54341346), we get a palindrome (697484796).

The spelling of 643143450 in words is "six hundred forty-three million, one hundred forty-three thousand, four hundred fifty".