1288998885 has 16 divisors (see below), whose sum is σ = 2063704896. Its totient is φ = 687030528.

The previous prime is 1288998883. The next prime is 1288998889. The reversal of 1288998885 is 5888998821.

It is not a de Polignac number, because 1288998885 - 2¹ = 1288998883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288998883) by changing a digit.

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, 2004 + ... + 50813.

It is an arithmetic number, because the mean of its divisors is an integer number (128981556).

Almost surely, 2^1288998885 is an apocalyptic number.

1288998885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1288998885 is a deficient number, since it is larger than the sum of its proper divisors (774706011).

1288998885 is a wasteful number, since it uses less digits than its factorization.

1288998885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54452.

The product of its digits is 26542080, while the sum is 66.

The square root of 1288998885 is about 35902.6306139258. The cubic root of 1288998885 is about 1088.3055582472.

The spelling of 1288998885 in words is "one billion, two hundred eighty-eight million, nine hundred ninety-eight thousand, eight hundred eighty-five".