6644217792 has 112 divisors (see below), whose sum is σ = 18086100480. Its totient is φ = 2151616512.

The previous prime is 6644217791. The next prime is 6644217793. The reversal of 6644217792 is 2977124466.

It is an interprime number because it is at equal distance from previous prime (6644217791) and next prime (6644217793).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644217791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1251688 + ... + 1256984.

It is an arithmetic number, because the mean of its divisors is an integer number (161483040).

Almost surely, 2^6644217792 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 6644217792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9043050240).

6644217792 is an abundant number, since it is smaller than the sum of its proper divisors (11441882688).

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

6644217792 is a wasteful number, since it uses less digits than its factorization.

6644217792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5498 (or 5488 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 48.

The square root of 6644217792 is about 81512.0714495712. The cubic root of 6644217792 is about 1879.9571621445.

The spelling of 6644217792 in words is "six billion, six hundred forty-four million, two hundred seventeen thousand, seven hundred ninety-two".