1172020605228 has 480 divisors, whose sum is σ = 3583810137600. Its totient is φ = 330249830400.

The previous prime is 1172020605221. The next prime is 1172020605229. The reversal of 1172020605228 is 8225060202711.

It is a happy number.

1172020605228 is a `hidden beast` number, since 1 + 1 + 7 + 2 + 0 + 20 + 605 + 2 + 28 = 666.

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 = 1172020605192 and 1172020605201.

It is not an unprimeable number, because it can be changed into a prime (1172020605221) by changing a digit.

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 159 ways as a sum of consecutive naturals, for example, 1524083628 + ... + 1524084396.

It is an arithmetic number, because the mean of its divisors is an integer number (7466271120).

Almost surely, 2^{1172020605228} is an apocalyptic number.

1172020605228 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 1172020605228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1791905068800).

1172020605228 is an abundant number, since it is smaller than the sum of its proper divisors (2411789532372).

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

1172020605228 is a wasteful number, since it uses less digits than its factorization.

1172020605228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203 (or 1192 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

Adding to 1172020605228 its reverse (8225060202711), we get a palindrome (9397080807939).

The spelling of 1172020605228 in words is "one trillion, one hundred seventy-two billion, twenty million, six hundred five thousand, two hundred twenty-eight".