1228811688 has 128 divisors (see below), whose sum is σ = 3761788800. Its totient is φ = 369266688.

The previous prime is 1228811687. The next prime is 1228811707. The reversal of 1228811688 is 8861188221.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1228811687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115656 + ... + 125832.

It is an arithmetic number, because the mean of its divisors is an integer number (29388975).

Almost surely, 2^1228811688 is an apocalyptic number.

1228811688 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 1228811688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1880894400).

1228811688 is an abundant number, since it is smaller than the sum of its proper divisors (2532977112).

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

1228811688 is a wasteful number, since it uses less digits than its factorization.

1228811688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10248 (or 10238 counting only the distinct ones).

The product of its digits is 98304, while the sum is 45.

The square root of 1228811688 is about 35054.4103929876. The cubic root of 1228811688 is about 1071.0961160983.

The spelling of 1228811688 in words is "one billion, two hundred twenty-eight million, eight hundred eleven thousand, six hundred eighty-eight".