1643488704 has 336 divisors, whose sum is σ = 5747064960. Its totient is φ = 459095040.

The previous prime is 1643488699. The next prime is 1643488711. The reversal of 1643488704 is 4078843461.

1643488704 is a `hidden beast` number, since 164 + 3 + 488 + 7 + 0 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1643488704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2223567 + ... + 2224305.

It is an arithmetic number, because the mean of its divisors is an integer number (17104360).

Almost surely, 2^1643488704 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 1643488704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2873532480).

1643488704 is an abundant number, since it is smaller than the sum of its proper divisors (4103576256).

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

1643488704 is a wasteful number, since it uses less digits than its factorization.

1643488704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The square root of 1643488704 is about 40539.9642821747. The cubic root of 1643488704 is about 1180.1093224387.

The spelling of 1643488704 in words is "one billion, six hundred forty-three million, four hundred eighty-eight thousand, seven hundred four".