1644450500 has 192 divisors, whose sum is σ = 4527484416. Its totient is φ = 511104000.

The previous prime is 1644450473. The next prime is 1644450529. The reversal of 1644450500 is 50544461.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4658324 + ... + 4658676.

It is an arithmetic number, because the mean of its divisors is an integer number (23580648).

Almost surely, 2^1644450500 is an apocalyptic number.

1644450500 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 1644450500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2263742208).

1644450500 is an abundant number, since it is smaller than the sum of its proper divisors (2883033916).

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

1644450500 is a wasteful number, since it uses less digits than its factorization.

1644450500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 1644450500 is about 40551.8248664595. The cubic root of 1644450500 is about 1180.3394838596.

Adding to 1644450500 its reverse (50544461), we get a palindrome (1694994961).

The spelling of 1644450500 in words is "one billion, six hundred forty-four million, four hundred fifty thousand, five hundred".