21878752 has 24 divisors (see below), whose sum is σ = 49227696. Its totient is φ = 9376512.

The previous prime is 21878749. The next prime is 21878761. The reversal of 21878752 is 25787812.

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, 48613 + ... + 49060.

It is an arithmetic number, because the mean of its divisors is an integer number (2051154).

Almost surely, 2^21878752 is an apocalyptic number.

It is an amenable number.

21878752 is an abundant number, since it is smaller than the sum of its proper divisors (27348944).

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

21878752 is an equidigital number, since it uses as much as digits as its factorization.

21878752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97690 (or 97682 counting only the distinct ones).

The product of its digits is 62720, while the sum is 40.

The square root of 21878752 is about 4677.4728219414. The cubic root of 21878752 is about 279.6882244002.

The spelling of 21878752 in words is "twenty-one million, eight hundred seventy-eight thousand, seven hundred fifty-two".