2644463264 has 48 divisors (see below), whose sum is σ = 5349989736. Its totient is φ = 1285939200.

The previous prime is 2644463243. The next prime is 2644463273. The reversal of 2644463264 is 4623644462.

It can be written as a sum of positive squares in 4 ways, for example, as 533979664 + 2110483600 = 23108^2 + 45940^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

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 7 ways as a sum of consecutive naturals, for example, 439154 + ... + 445134.

Almost surely, 2^2644463264 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 2644463264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2674994868).

2644463264 is an abundant number, since it is smaller than the sum of its proper divisors (2705526472).

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

2644463264 is a wasteful number, since it uses less digits than its factorization.

2644463264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369 (or 6361 counting only the distinct ones).

The product of its digits is 663552, while the sum is 41.

The square root of 2644463264 is about 51424.3450517360. The cubic root of 2644463264 is about 1382.8630722179.

The spelling of 2644463264 in words is "two billion, six hundred forty-four million, four hundred sixty-three thousand, two hundred sixty-four".