13620745728 has 160 divisors (see below), whose sum is σ = 42072307200. Its totient is φ = 4342745088.

The previous prime is 13620745727. The next prime is 13620745739. The reversal of 13620745728 is 82754702631.

13620745728 is a `hidden beast` number, since 1 + 3 + 6 + 2 + 0 + 74 + 572 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13620745727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296533 + ... + 339371.

It is an arithmetic number, because the mean of its divisors is an integer number (262951920).

Almost surely, 2^13620745728 is an apocalyptic number.

13620745728 is a gapful number since it is divisible by the number (18) 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 13620745728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21036153600).

13620745728 is an abundant number, since it is smaller than the sum of its proper divisors (28451561472).

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

13620745728 is an equidigital number, since it uses as much as digits as its factorization.

13620745728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42889 (or 42867 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 13620745728 in words is "thirteen billion, six hundred twenty million, seven hundred forty-five thousand, seven hundred twenty-eight".