19688928 has 96 divisors (see below), whose sum is σ = 59947776. Its totient is φ = 5541888.

The previous prime is 19688927. The next prime is 19688953. The reversal of 19688928 is 82988691.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19688927) 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, 55600 + ... + 55952.

It is an arithmetic number, because the mean of its divisors is an integer number (624456).

Almost surely, 2^19688928 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 19688928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29973888).

19688928 is an abundant number, since it is smaller than the sum of its proper divisors (40258848).

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

19688928 is a wasteful number, since it uses less digits than its factorization.

19688928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 448 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 19688928 is about 4437.2207517769. The cubic root of 19688928 is about 270.0271029034.

The spelling of 19688928 in words is "nineteen million, six hundred eighty-eight thousand, nine hundred twenty-eight".