3781212228 has 72 divisors (see below), whose sum is σ = 10076451840. Its totient is φ = 1193777280.

The previous prime is 3781212221. The next prime is 3781212263. The reversal of 3781212228 is 8222121873.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 3781212192 and 3781212201.

It is not an unprimeable number, because it can be changed into a prime (3781212221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16408 + ... + 88496.

It is an arithmetic number, because the mean of its divisors is an integer number (139950720).

Almost surely, 2^3781212228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3781212228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5038225920).

3781212228 is an abundant number, since it is smaller than the sum of its proper divisors (6295239612).

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

3781212228 is a wasteful number, since it uses less digits than its factorization.

3781212228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72177 (or 72172 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 3781212228 is about 61491.5622504421. The cubic root of 3781212228 is about 1557.9147335709.

The spelling of 3781212228 in words is "three billion, seven hundred eighty-one million, two hundred twelve thousand, two hundred twenty-eight".