1320778988 has 6 divisors (see below), whose sum is σ = 2311363236. Its totient is φ = 660389492.

The previous prime is 1320778981. The next prime is 1320778993. The reversal of 1320778988 is 8898770231.

It is not an unprimeable number, because it can be changed into a prime (1320778981) 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 as a sum of consecutive naturals, namely, 165097370 + ... + 165097377.

It is an arithmetic number, because the mean of its divisors is an integer number (385227206).

Almost surely, 2^1320778988 is an apocalyptic number.

It is an amenable number.

1320778988 is a deficient number, since it is larger than the sum of its proper divisors (990584248).

1320778988 is a wasteful number, since it uses less digits than its factorization.

1320778988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330194751 (or 330194749 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 53.

The square root of 1320778988 is about 36342.5231375038. The cubic root of 1320778988 is about 1097.1770558543.

The spelling of 1320778988 in words is "one billion, three hundred twenty million, seven hundred seventy-eight thousand, nine hundred eighty-eight".