643039320 has 128 divisors (see below), whose sum is σ = 2405168640. Its totient is φ = 133616640.

The previous prime is 643039303. The next prime is 643039321. The reversal of 643039320 is 23930346.

643039320 is digitally balanced in base 6, 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (643039321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25557 + ... + 44036.

It is an arithmetic number, because the mean of its divisors is an integer number (18790380).

Almost surely, 2^643039320 is an apocalyptic number.

643039320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643039320 is an abundant number, since it is smaller than the sum of its proper divisors (1762129320).

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

643039320 is a wasteful number, since it uses less digits than its factorization.

643039320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69625 (or 69621 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 30.

The square root of 643039320 is about 25358.2199690751. The cubic root of 643039320 is about 863.1358923313.

Adding to 643039320 its reverse (23930346), we get a palindrome (666969666).

The spelling of 643039320 in words is "six hundred forty-three million, thirty-nine thousand, three hundred twenty".