21748064 has 48 divisors (see below), whose sum is σ = 48136032. Its totient is φ = 9596928.

The previous prime is 21748063. The next prime is 21748091. The reversal of 21748064 is 46084712.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21748064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21748061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8432 + ... + 10704.

It is an arithmetic number, because the mean of its divisors is an integer number (1002834).

Almost surely, 2^21748064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21748064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24068016).

21748064 is an abundant number, since it is smaller than the sum of its proper divisors (26387968).

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

21748064 is a wasteful number, since it uses less digits than its factorization.

21748064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319 (or 2311 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 21748064 is about 4663.4819609386. The cubic root of 21748064 is about 279.1302261586.

The spelling of 21748064 in words is "twenty-one million, seven hundred forty-eight thousand, sixty-four".