1643008432 has 80 divisors (see below), whose sum is σ = 3725317120. Its totient is φ = 695174400.

The previous prime is 1643008417. The next prime is 1643008439. The reversal of 1643008432 is 2348003461.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 1643008394 and 1643008403.

It is not an unprimeable number, because it can be changed into a prime (1643008439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115807 + ... + 129217.

It is an arithmetic number, because the mean of its divisors is an integer number (46566464).

Almost surely, 2^1643008432 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 1643008432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1862658560).

1643008432 is an abundant number, since it is smaller than the sum of its proper divisors (2082308688).

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

1643008432 is a wasteful number, since it uses less digits than its factorization.

1643008432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13482 (or 13476 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 1643008432 is about 40534.0404104994. The cubic root of 1643008432 is about 1179.9943579161.

The spelling of 1643008432 in words is "one billion, six hundred forty-three million, eight thousand, four hundred thirty-two".