1278083885 has 16 divisors (see below), whose sum is σ = 1748836656. Its totient is φ = 888296448.

The previous prime is 1278083881. The next prime is 1278083921. The reversal of 1278083885 is 5883808721.

It can be written as a sum of positive squares in 8 ways, for example, as 58537801 + 1219546084 = 7651^2 + 34922^2 .

It is not a de Polignac number, because 1278083885 - 2² = 1278083881 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278083881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 577214 + ... + 579423.

It is an arithmetic number, because the mean of its divisors is an integer number (109302291).

Almost surely, 2^1278083885 is an apocalyptic number.

It is an amenable number.

1278083885 is a deficient number, since it is larger than the sum of its proper divisors (470752771).

1278083885 is a wasteful number, since it uses less digits than its factorization.

1278083885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156672.

The product of its (nonzero) digits is 860160, while the sum is 50.

The square root of 1278083885 is about 35750.2990896580. The cubic root of 1278083885 is about 1085.2249910361.

The spelling of 1278083885 in words is "one billion, two hundred seventy-eight million, eighty-three thousand, eight hundred eighty-five".