21888608 has 96 divisors (see below), whose sum is σ = 53625600. Its totient is φ = 8584704.

The previous prime is 21888599. The next prime is 21888623. The reversal of 21888608 is 80688812.

It is a super-2 number, since 2×21888608² = 958222320355328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157403 + ... + 157541.

It is an arithmetic number, because the mean of its divisors is an integer number (558600).

Almost surely, 2^21888608 is an apocalyptic number.

21888608 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21888608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26812800).

21888608 is an abundant number, since it is smaller than the sum of its proper divisors (31736992).

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

21888608 is a wasteful number, since it uses less digits than its factorization.

21888608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 41.

The square root of 21888608 is about 4678.5262636860. The cubic root of 21888608 is about 279.7302163339.

It can be divided in two parts, 21888 and 608, that multiplied together give a square (13307904 = 3648²).

The spelling of 21888608 in words is "twenty-one million, eight hundred eighty-eight thousand, six hundred eight".