19008785808 has 280 divisors, whose sum is σ = 57020209848. Its totient is φ = 6133211136.

The previous prime is 19008785801. The next prime is 19008785813. The reversal of 19008785808 is 80858780091.

It can be written as a sum of positive squares in 4 ways, for example, as 812934144 + 18195851664 = 28512^2 + 134892^2 .

It is a super-2 number, since 2×19008785808² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19008785801) 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 55 ways as a sum of consecutive naturals, for example, 59964466 + ... + 59964782.

Almost surely, 2^19008785808 is an apocalyptic number.

19008785808 is a gapful number since it is divisible by the number (18) 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 19008785808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28510104924).

19008785808 is an abundant number, since it is smaller than the sum of its proper divisors (38011424040).

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

19008785808 is an equidigital number, since it uses as much as digits as its factorization.

19008785808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 54.

The spelling of 19008785808 in words is "nineteen billion, eight million, seven hundred eighty-five thousand, eight hundred eight".