643221300282 has 32 divisors (see below), whose sum is σ = 1403420359680. Its totient is φ = 194911596720.

The previous prime is 643221300251. The next prime is 643221300349. The reversal of 643221300282 is 282003122346.

It is a super-2 number, since 2×643221300282² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6450133 + ... + 6549095.

It is an arithmetic number, because the mean of its divisors is an integer number (43856886240).

Almost surely, 2^643221300282 is an apocalyptic number.

643221300282 is an abundant number, since it is smaller than the sum of its proper divisors (760199059398).

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

643221300282 is a wasteful number, since it uses less digits than its factorization.

643221300282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197458.

The product of its (nonzero) digits is 27648, while the sum is 33.

The spelling of 643221300282 in words is "six hundred forty-three billion, two hundred twenty-one million, three hundred thousand, two hundred eighty-two".