21875648 has 28 divisors (see below), whose sum is σ = 44424600. Its totient is φ = 10682112.

The previous prime is 21875647. The next prime is 21875699. The reversal of 21875648 is 84657812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21875647) 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, 1223 + ... + 6726.

Almost surely, 2^21875648 is an apocalyptic number.

It is an amenable number.

21875648 is an abundant number, since it is smaller than the sum of its proper divisors (22548952).

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

21875648 is an equidigital number, since it uses as much as digits as its factorization.

21875648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8004 (or 7994 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 21875648 is about 4677.1410070683. The cubic root of 21875648 is about 279.6749970566.

The spelling of 21875648 in words is "twenty-one million, eight hundred seventy-five thousand, six hundred forty-eight".