6642220840 has 32 divisors (see below), whose sum is σ = 15000168960. Its totient is φ = 2647080000.

The previous prime is 6642220817. The next prime is 6642220847. The reversal of 6642220840 is 480222466.

It is a junction number, because it is equal to n+sod(n) for n = 6642220796 and 6642220805.

It is not an unprimeable number, because it can be changed into a prime (6642220847) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 295536 + ... + 317215.

It is an arithmetic number, because the mean of its divisors is an integer number (468755280).

Almost surely, 2^6642220840 is an apocalyptic number.

It is an amenable number.

6642220840 is an abundant number, since it is smaller than the sum of its proper divisors (8357948120).

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

6642220840 is a wasteful number, since it uses less digits than its factorization.

6642220840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613033 (or 613029 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 6642220840 is about 81499.8211040981. The cubic root of 6642220840 is about 1879.7687998467.

The spelling of 6642220840 in words is "six billion, six hundred forty-two million, two hundred twenty thousand, eight hundred forty".