643256000620 has 96 divisors (see below), whose sum is σ = 1425737617920. Its totient is φ = 243109278720.

The previous prime is 643256000603. The next prime is 643256000663. The reversal of 643256000620 is 26000652346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323731267 + ... + 323733253.

It is an arithmetic number, because the mean of its divisors is an integer number (14851433520).

Almost surely, 2^643256000620 is an apocalyptic number.

It is an amenable number.

643256000620 is an abundant number, since it is smaller than the sum of its proper divisors (782481617300).

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

643256000620 is a wasteful number, since it uses less digits than its factorization.

643256000620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3863 (or 3861 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 643256000620 its reverse (26000652346), we get a palindrome (669256652966).

The spelling of 643256000620 in words is "six hundred forty-three billion, two hundred fifty-six million, six hundred twenty", and thus it is an aban number.