2644266240 has 648 divisors, whose sum is σ = 11535224064. Its totient is φ = 547430400.

The previous prime is 2644266239. The next prime is 2644266257. The reversal of 2644266240 is 426624462.

2644266240 is a `hidden beast` number, since 2 + 6 + 4 + 4 + 26 + 624 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2644266195 and 2644266204.

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 9757305 + ... + 9757575.

Almost surely, 2^2644266240 is an apocalyptic number.

2644266240 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 2644266240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5767612032).

2644266240 is an abundant number, since it is smaller than the sum of its proper divisors (8890957824).

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

2644266240 is a wasteful number, since it uses less digits than its factorization.

2644266240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 2644266240 is about 51422.4293475133. The cubic root of 2644266240 is about 1382.8287282631.

The spelling of 2644266240 in words is "two billion, six hundred forty-four million, two hundred sixty-six thousand, two hundred forty".