1320129228 has 48 divisors (see below), whose sum is σ = 3362679936. Its totient is φ = 399759360.

The previous prime is 1320129149. The next prime is 1320129233. The reversal of 1320129228 is 8229210231.

It is a junction number, because it is equal to n+sod(n) for n = 1320129195 and 1320129204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261900 + ... + 266892.

It is an arithmetic number, because the mean of its divisors is an integer number (70055832).

Almost surely, 2^1320129228 is an apocalyptic number.

It is an amenable number.

1320129228 is an abundant number, since it is smaller than the sum of its proper divisors (2042550708).

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

1320129228 is a wasteful number, since it uses less digits than its factorization.

1320129228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7014 (or 7012 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1320129228 is about 36333.5826474627. The cubic root of 1320129228 is about 1096.9971068225.

Adding to 1320129228 its reverse (8229210231), we get a palindrome (9549339459).

The spelling of 1320129228 in words is "one billion, three hundred twenty million, one hundred twenty-nine thousand, two hundred twenty-eight".