15721248 has 48 divisors (see below), whose sum is σ = 42698880. Its totient is φ = 5058816.

The previous prime is 15721241. The next prime is 15721249. The reversal of 15721248 is 84212751.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (15721241) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 40 + ... + 5607.

It is an arithmetic number, because the mean of its divisors is an integer number (889560).

Almost surely, 2^15721248 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 15721248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21349440).

15721248 is an abundant number, since it is smaller than the sum of its proper divisors (26977632).

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

15721248 is a wasteful number, since it uses less digits than its factorization.

15721248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5689 (or 5681 counting only the distinct ones).

The product of its digits is 4480, while the sum is 30.

The square root of 15721248 is about 3965.0029003772. The cubic root of 15721248 is about 250.5122722582.

Adding to 15721248 its reverse (84212751), we get a palindrome (99933999).

The spelling of 15721248 in words is "fifteen million, seven hundred twenty-one thousand, two hundred forty-eight".