2644655420 has 48 divisors (see below), whose sum is σ = 6095029248. Its totient is φ = 955920960.

The previous prime is 2644655413. The next prime is 2644655441. The reversal of 2644655420 is 245564462.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 749 + ... + 72731.

It is an arithmetic number, because the mean of its divisors is an integer number (126979776).

Almost surely, 2^2644655420 is an apocalyptic number.

2644655420 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 2644655420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3047514624).

2644655420 is an abundant number, since it is smaller than the sum of its proper divisors (3450373828).

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

2644655420 is a wasteful number, since it uses less digits than its factorization.

2644655420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72170 (or 72168 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 38.

The square root of 2644655420 is about 51426.2133546696. The cubic root of 2644655420 is about 1382.8965659712.

The spelling of 2644655420 in words is "two billion, six hundred forty-four million, six hundred fifty-five thousand, four hundred twenty".