2644646620 has 192 divisors, whose sum is σ = 7155993600. Its totient is φ = 813792000.

The previous prime is 2644646593. The next prime is 2644646647. The reversal of 2644646620 is 266464462.

2644646620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2644646593) and next prime (2644646647).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7621287 + ... + 7621633.

It is an arithmetic number, because the mean of its divisors is an integer number (37270800).

Almost surely, 2^2644646620 is an apocalyptic number.

2644646620 is a gapful number since it is divisible by the number (20) 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 2644646620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3577996800).

2644646620 is an abundant number, since it is smaller than the sum of its proper divisors (4511346980).

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

2644646620 is a wasteful number, since it uses less digits than its factorization.

2644646620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 473 counting only the distinct ones).

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

The square root of 2644646620 is about 51426.1277951199. The cubic root of 2644646620 is about 1382.8950321226.

The spelling of 2644646620 in words is "two billion, six hundred forty-four million, six hundred forty-six thousand, six hundred twenty".