13620728 has 24 divisors (see below), whose sum is σ = 28073640. Its totient is φ = 6190800.

The previous prime is 13620727. The next prime is 13620781. The reversal of 13620728 is 82702631.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 13620728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13620721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6068 + ... + 8003.

It is an arithmetic number, because the mean of its divisors is an integer number (1169735).

Almost surely, 2^13620728 is an apocalyptic number.

It is an amenable number.

13620728 is an abundant number, since it is smaller than the sum of its proper divisors (14452912).

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

13620728 is a wasteful number, since it uses less digits than its factorization.

13620728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14099 (or 14084 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 13620728 is about 3690.6270469935. The cubic root of 13620728 is about 238.8178440820.

The spelling of 13620728 in words is "thirteen million, six hundred twenty thousand, seven hundred twenty-eight".