19239768108 has 144 divisors (see below), whose sum is σ = 54955514880. Its totient is φ = 5816653920.

The previous prime is 19239768103. The next prime is 19239768109. The reversal of 19239768108 is 80186793291.

19239768108 is a `hidden beast` number, since 1 + 92 + 397 + 68 + 108 = 666.

It is a super-2 number, since 2×19239768108² (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 (19239768103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6571741 + ... + 6574667.

It is an arithmetic number, because the mean of its divisors is an integer number (381635520).

Almost surely, 2^19239768108 is an apocalyptic number.

19239768108 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 19239768108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27477757440).

19239768108 is an abundant number, since it is smaller than the sum of its proper divisors (35715746772).

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

19239768108 is a wasteful number, since it uses less digits than its factorization.

19239768108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3465 (or 3446 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 19239768108 in words is "nineteen billion, two hundred thirty-nine million, seven hundred sixty-eight thousand, one hundred eight".