1721903568 has 240 divisors, whose sum is σ = 5729716608. Its totient is φ = 435916800.

The previous prime is 1721903563. The next prime is 1721903569. The reversal of 1721903568 is 8653091271.

It is a super-2 number, since 2×1721903568² = 5929903794982261248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721903563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1666380 + ... + 1667412.

Almost surely, 2^1721903568 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 1721903568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2864858304).

1721903568 is an abundant number, since it is smaller than the sum of its proper divisors (4007813040).

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

1721903568 is a wasteful number, since it uses less digits than its factorization.

1721903568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 1721903568 is about 41495.8259105660. The cubic root of 1721903568 is about 1198.5871260310.

The spelling of 1721903568 in words is "one billion, seven hundred twenty-one million, nine hundred three thousand, five hundred sixty-eight".