21880648 has 8 divisors (see below), whose sum is σ = 41026230. Its totient is φ = 10940320.

The previous prime is 21880643. The next prime is 21880657. The reversal of 21880648 is 84608812.

It can be written as a sum of positive squares in only one way, i.e., 21178404 + 702244 = 4602^2 + 838^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21880643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1367533 + ... + 1367548.

Almost surely, 2^21880648 is an apocalyptic number.

It is an amenable number.

21880648 is a deficient number, since it is larger than the sum of its proper divisors (19145582).

21880648 is a wasteful number, since it uses less digits than its factorization.

21880648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735087 (or 2735083 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 21880648 is about 4677.6754910960. The cubic root of 21880648 is about 279.6963033734.

The spelling of 21880648 in words is "twenty-one million, eight hundred eighty thousand, six hundred forty-eight".