19988288 has 56 divisors (see below), whose sum is σ = 42623232. Its totient is φ = 9275904.

The previous prime is 19988257. The next prime is 19988291. The reversal of 19988288 is 88288991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54281 + ... + 54647.

Almost surely, 2^19988288 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 19988288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21311616).

19988288 is an abundant number, since it is smaller than the sum of its proper divisors (22634944).

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

19988288 is a wasteful number, since it uses less digits than its factorization.

19988288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 429 counting only the distinct ones).

The product of its digits is 663552, while the sum is 53.

The square root of 19988288 is about 4470.8263218336. The cubic root of 19988288 is about 271.3887658815.

The spelling of 19988288 in words is "nineteen million, nine hundred eighty-eight thousand, two hundred eighty-eight".