21928896 has 84 divisors (see below), whose sum is σ = 68589144. Its totient is φ = 6643200.

The previous prime is 21928883. The next prime is 21928903. The reversal of 21928896 is 69882912.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4606 + ... + 8066.

Almost surely, 2^21928896 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 21928896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34294572).

21928896 is an abundant number, since it is smaller than the sum of its proper divisors (46660248).

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

21928896 is a wasteful number, since it uses less digits than its factorization.

21928896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490 (or 3477 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 21928896 is about 4682.8299136313. The cubic root of 21928896 is about 279.9017342252.

The spelling of 21928896 in words is "twenty-one million, nine hundred twenty-eight thousand, eight hundred ninety-six".