13208728 has 64 divisors (see below), whose sum is σ = 29272320. Its totient is φ = 5529600.

The previous prime is 13208719. The next prime is 13208731. The reversal of 13208728 is 82780231.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 13208728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54688 + ... + 54928.

It is an arithmetic number, because the mean of its divisors is an integer number (457380).

Almost surely, 2^13208728 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 13208728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14636160).

13208728 is an abundant number, since it is smaller than the sum of its proper divisors (16063592).

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

13208728 is a wasteful number, since it uses less digits than its factorization.

13208728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 13208728 is about 3634.3813778964. The cubic root of 13208728 is about 236.3852273983.

Adding to 13208728 its reverse (82780231), we get a palindrome (95988959).

The spelling of 13208728 in words is "thirteen million, two hundred eight thousand, seven hundred twenty-eight".