643263828480 has 1280 divisors, whose sum is σ = 2903814144000. Its totient is φ = 131303669760.

The previous prime is 643263828479. The next prime is 643263828521. The reversal of 643263828480 is 84828362346.

643263828480 is a `hidden beast` number, since 6 + 4 + 326 + 38 + 284 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1280).

It is a super-2 number, since 2×643263828480² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 194985871 + ... + 194989169.

It is an arithmetic number, because the mean of its divisors is an integer number (2268604800).

Almost surely, 2^643263828480 is an apocalyptic number.

643263828480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643263828480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451907072000).

643263828480 is an abundant number, since it is smaller than the sum of its proper divisors (2260550315520).

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

643263828480 is a wasteful number, since it uses less digits than its factorization.

643263828480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382 (or 3360 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 54.

The spelling of 643263828480 in words is "six hundred forty-three billion, two hundred sixty-three million, eight hundred twenty-eight thousand, four hundred eighty".