15728320 has 56 divisors (see below), whose sum is σ = 39099744. Its totient is φ = 6014976.

The previous prime is 15728309. The next prime is 15728327. The reversal of 15728320 is 2382751.

It is not an unprimeable number, because it can be changed into a prime (15728327) 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, 6292 + ... + 8428.

Almost surely, 2^15728320 is an apocalyptic number.

15728320 is a gapful number since it is divisible by the number (10) 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 15728320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19549872).

15728320 is an abundant number, since it is smaller than the sum of its proper divisors (23371424).

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

15728320 is a wasteful number, since it uses less digits than its factorization.

15728320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177 (or 2167 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 15728320 is about 3965.8946027347. The cubic root of 15728320 is about 250.5498298620.

The spelling of 15728320 in words is "fifteen million, seven hundred twenty-eight thousand, three hundred twenty".