19689648 has 80 divisors (see below), whose sum is σ = 56246400. Its totient is φ = 5885440.

The previous prime is 19689623. The next prime is 19689671. The reversal of 19689648 is 84698691.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19689648.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46783 + ... + 47201.

It is an arithmetic number, because the mean of its divisors is an integer number (703080).

Almost surely, 2^19689648 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 19689648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28123200).

19689648 is an abundant number, since it is smaller than the sum of its proper divisors (36556752).

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

19689648 is a wasteful number, since it uses less digits than its factorization.

19689648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 524 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The square root of 19689648 is about 4437.3018829014. The cubic root of 19689648 is about 270.0303943835.

The spelling of 19689648 in words is "nineteen million, six hundred eighty-nine thousand, six hundred forty-eight".