3728111220 has 144 divisors (see below), whose sum is σ = 12604213440. Its totient is φ = 886422528.

The previous prime is 3728111161. The next prime is 3728111287. The reversal of 3728111220 is 221118273.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26079 + ... + 90201.

It is an arithmetic number, because the mean of its divisors is an integer number (87529260).

Almost surely, 2^3728111220 is an apocalyptic number.

3728111220 is a gapful number since it is divisible by the number (30) 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 3728111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6302106720).

3728111220 is an abundant number, since it is smaller than the sum of its proper divisors (8876102220).

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

3728111220 is a wasteful number, since it uses less digits than its factorization.

3728111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64174 (or 64169 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 3728111220 is about 61058.2608661596. The cubic root of 3728111220 is about 1550.5875289161.

Adding to 3728111220 its reverse (221118273), we get a palindrome (3949229493).

The spelling of 3728111220 in words is "three billion, seven hundred twenty-eight million, one hundred eleven thousand, two hundred twenty".