13228787936 has 144 divisors (see below), whose sum is σ = 33164752320. Its totient is φ = 5147089920.

The previous prime is 13228787911. The next prime is 13228787953. The reversal of 13228787936 is 63978782231.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1238105 + ... + 1248743.

It is an arithmetic number, because the mean of its divisors is an integer number (230310780).

Almost surely, 2^13228787936 is an apocalyptic number.

13228787936 is a gapful number since it is divisible by the number (16) 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 13228787936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16582376160).

13228787936 is an abundant number, since it is smaller than the sum of its proper divisors (19935964384).

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

13228787936 is a wasteful number, since it uses less digits than its factorization.

13228787936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10737 (or 10722 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 56.

The spelling of 13228787936 in words is "thirteen billion, two hundred twenty-eight million, seven hundred eighty-seven thousand, nine hundred thirty-six".