21888704 has 28 divisors (see below), whose sum is σ = 43793664. Its totient is φ = 10854144.

The previous prime is 21888689. The next prime is 21888721. The reversal of 21888704 is 40788812.

It is a happy number.

21888704 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6782 + ... + 9474.

Almost surely, 2^21888704 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 21888704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21896832).

21888704 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21888704 is a wasteful number, since it uses less digits than its factorization.

21888704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2832 (or 2822 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 21888704 is about 4678.5365233158. The cubic root of 21888704 is about 279.7306252842.

The spelling of 21888704 in words is "twenty-one million, eight hundred eighty-eight thousand, seven hundred four".