13285720 has 64 divisors (see below), whose sum is σ = 35665920. Its totient is φ = 4354944.

The previous prime is 13285717. The next prime is 13285757. The reversal of 13285720 is 2758231.

13285720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 5409 + ... + 7471.

It is an arithmetic number, because the mean of its divisors is an integer number (557280).

Almost surely, 2^13285720 is an apocalyptic number.

13285720 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 13285720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17832960).

13285720 is an abundant number, since it is smaller than the sum of its proper divisors (22380200).

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

13285720 is a wasteful number, since it uses less digits than its factorization.

13285720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2104 (or 2100 counting only the distinct ones).

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

The square root of 13285720 is about 3644.9581616255. The cubic root of 13285720 is about 236.8436244044.

The spelling of 13285720 in words is "thirteen million, two hundred eighty-five thousand, seven hundred twenty".