643630050 has 240 divisors, whose sum is σ = 2078474112. Its totient is φ = 144633600.

The previous prime is 643630049. The next prime is 643630051. The reversal of 643630050 is 50036346.

It is an interprime number because it is at equal distance from previous prime (643630049) and next prime (643630051).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 643629996 and 643630023.

It is not an unprimeable number, because it can be changed into a prime (643630051) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2069395 + ... + 2069705.

Almost surely, 2^643630050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643630050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1039237056).

643630050 is an abundant number, since it is smaller than the sum of its proper divisors (1434844062).

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

643630050 is a wasteful number, since it uses less digits than its factorization.

643630050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 643630050 is about 25369.8649976700. The cubic root of 643630050 is about 863.4001188958.

Adding to 643630050 its reverse (50036346), we get a palindrome (693666396).

The spelling of 643630050 in words is "six hundred forty-three million, six hundred thirty thousand, fifty".