1043644320 has 144 divisors (see below), whose sum is σ = 3716399232. Its totient is φ = 266196480.

The previous prime is 1043644309. The next prime is 1043644321. The reversal of 1043644320 is 234463401.

1043644320 is a `hidden beast` number, since 10 + 4 + 3 + 644 + 3 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (1043644321) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 17365 + ... + 48875.

It is an arithmetic number, because the mean of its divisors is an integer number (25808328).

Almost surely, 2^1043644320 is an apocalyptic number.

1043644320 is a gapful number since it is divisible by the number (10) 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 1043644320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1858199616).

1043644320 is an abundant number, since it is smaller than the sum of its proper divisors (2672754912).

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

1043644320 is a wasteful number, since it uses less digits than its factorization.

1043644320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31555 (or 31544 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 1043644320 is about 32305.4843641138. The cubic root of 1043644320 is about 1014.3414463477.

It can be divided in two parts, 10436 and 44320, that added together give a square (54756 = 234²).

The spelling of 1043644320 in words is "one billion, forty-three million, six hundred forty-four thousand, three hundred twenty".