17720487840 has 192 divisors, whose sum is σ = 62858944512. Its totient is φ = 4157260800.

The previous prime is 17720487823. The next prime is 17720487853. The reversal of 17720487840 is 4878402771.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 17720487840.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 109549 + ... + 217811.

It is an arithmetic number, because the mean of its divisors is an integer number (327390336).

Almost surely, 2^17720487840 is an apocalyptic number.

17720487840 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 17720487840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31429472256).

17720487840 is an abundant number, since it is smaller than the sum of its proper divisors (45138456672).

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

17720487840 is a wasteful number, since it uses less digits than its factorization.

17720487840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108323 (or 108315 counting only the distinct ones).

The product of its (nonzero) digits is 702464, while the sum is 48.

The spelling of 17720487840 in words is "seventeen billion, seven hundred twenty million, four hundred eighty-seven thousand, eight hundred forty".