19638893568 has 176 divisors, whose sum is σ = 60179834880. Its totient is φ = 5577621504.

The previous prime is 19638893567. The next prime is 19638893569. The reversal of 19638893568 is 86539883691.

It is an interprime number because it is at equal distance from previous prime (19638893567) and next prime (19638893569).

It is a super-2 number, since 2×19638893568² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19638893499 and 19638893508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19638893567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3717553 + ... + 3722831.

It is an arithmetic number, because the mean of its divisors is an integer number (341930880).

Almost surely, 2^19638893568 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 19638893568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30089917440).

19638893568 is an abundant number, since it is smaller than the sum of its proper divisors (40540941312).

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

19638893568 is a wasteful number, since it uses less digits than its factorization.

19638893568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5482 (or 5464 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 66.

The spelling of 19638893568 in words is "nineteen billion, six hundred thirty-eight million, eight hundred ninety-three thousand, five hundred sixty-eight".