1320778895 has 4 divisors (see below), whose sum is σ = 1584934680. Its totient is φ = 1056623112.

The previous prime is 1320778889. The next prime is 1320778931. The reversal of 1320778895 is 5988770231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5988770231 = 3709 ⋅1614659.

It is a cyclic number.

It is not a de Polignac number, because 1320778895 - 2⁶ = 1320778831 is a prime.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 132077885 + ... + 132077894.

It is an arithmetic number, because the mean of its divisors is an integer number (396233670).

Almost surely, 2^1320778895 is an apocalyptic number.

1320778895 is a deficient number, since it is larger than the sum of its proper divisors (264155785).

1320778895 is an equidigital number, since it uses as much as digits as its factorization.

1320778895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264155784.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 1320778895 is about 36342.5218580109. The cubic root of 1320778895 is about 1097.1770301024.

The spelling of 1320778895 in words is "one billion, three hundred twenty million, seven hundred seventy-eight thousand, eight hundred ninety-five".