6644246620 has 96 divisors (see below), whose sum is σ = 15605001216. Its totient is φ = 2355936000.

The previous prime is 6644246593. The next prime is 6644246627. The reversal of 6644246620 is 266424466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644246627) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1486509 + ... + 1490971.

It is an arithmetic number, because the mean of its divisors is an integer number (162552096).

Almost surely, 2^6644246620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6644246620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7802500608).

6644246620 is an abundant number, since it is smaller than the sum of its proper divisors (8960754596).

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

6644246620 is a wasteful number, since it uses less digits than its factorization.

6644246620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4651 (or 4649 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The square root of 6644246620 is about 81512.2482820833. The cubic root of 6644246620 is about 1879.9598810663.

The spelling of 6644246620 in words is "six billion, six hundred forty-four million, two hundred forty-six thousand, six hundred twenty".