21878600 has 48 divisors (see below), whose sum is σ = 51298800. Its totient is φ = 8677440.

The previous prime is 21878573. The next prime is 21878621. The reversal of 21878600 is 687812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27407 + ... + 28193.

It is an arithmetic number, because the mean of its divisors is an integer number (1068725).

Almost surely, 2^21878600 is an apocalyptic number.

21878600 is a gapful number since it is divisible by the number (20) 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 21878600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25649400).

21878600 is an abundant number, since it is smaller than the sum of its proper divisors (29420200).

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

21878600 is a wasteful number, since it uses less digits than its factorization.

21878600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 21878600 is about 4677.4565738230. The cubic root of 21878600 is about 279.6875766986.

The spelling of 21878600 in words is "twenty-one million, eight hundred seventy-eight thousand, six hundred".