21880448 has 32 divisors (see below), whose sum is σ = 43860000. Its totient is φ = 10872576.

The previous prime is 21880447. The next prime is 21880459. The reversal of 21880448 is 84408812.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (21880447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25043 + ... + 25901.

It is an arithmetic number, because the mean of its divisors is an integer number (1370625).

Almost surely, 2^21880448 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 21880448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21930000).

21880448 is an abundant number, since it is smaller than the sum of its proper divisors (21979552).

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

21880448 is an equidigital number, since it uses as much as digits as its factorization.

21880448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072 (or 1060 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 21880448 is about 4677.6541129075. The cubic root of 21880448 is about 279.6954511831.

The spelling of 21880448 in words is "twenty-one million, eight hundred eighty thousand, four hundred forty-eight".