21648608 has 24 divisors (see below), whose sum is σ = 43614648. Its totient is φ = 10571904.

The previous prime is 21648593. The next prime is 21648631. The reversal of 21648608 is 80684612.

It is a congruent 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, 6491 + ... + 9242.

It is an arithmetic number, because the mean of its divisors is an integer number (1817277).

Almost surely, 2^21648608 is an apocalyptic number.

It is an amenable number.

21648608 is an abundant number, since it is smaller than the sum of its proper divisors (21966040).

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

21648608 is a wasteful number, since it uses less digits than its factorization.

21648608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15786 (or 15778 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 21648608 is about 4652.8064649199. The cubic root of 21648608 is about 278.7040793868.

The spelling of 21648608 in words is "twenty-one million, six hundred forty-eight thousand, six hundred eight".