1228138035208 has 64 divisors (see below), whose sum is σ = 2694029247360. Its totient is φ = 513893915136.

The previous prime is 1228138035203. The next prime is 1228138035211. The reversal of 1228138035208 is 8025308318221.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (1228138035203) 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, 5851866 + ... + 6058102.

It is an arithmetic number, because the mean of its divisors is an integer number (42094206990).

Almost surely, 2^{1228138035208} 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 1228138035208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1347014623680).

1228138035208 is an abundant number, since it is smaller than the sum of its proper divisors (1465891212152).

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

1228138035208 is a wasteful number, since it uses less digits than its factorization.

1228138035208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208766 (or 208762 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 1228138035208 in words is "one trillion, two hundred twenty-eight billion, one hundred thirty-eight million, thirty-five thousand, two hundred eight".