643284328000 has 56 divisors (see below), whose sum is σ = 1593093658104. Its totient is φ = 257313728000.

The previous prime is 643284327989. The next prime is 643284328031. The reversal of 643284328000 is 823482346.

It can be written as a sum of positive squares in 4 ways, for example, as 84067523136 + 559216804864 = 289944^2 + 747808^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40197271 + ... + 40213270.

Almost surely, 2^643284328000 is an apocalyptic number.

It is an amenable number.

643284328000 is an abundant number, since it is smaller than the sum of its proper divisors (949809330104).

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

643284328000 is an equidigital number, since it uses as much as digits as its factorization.

643284328000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80410568 (or 80410548 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The spelling of 643284328000 in words is "six hundred forty-three billion, two hundred eighty-four million, three hundred twenty-eight thousand".