1288790665 has 16 divisors (see below), whose sum is σ = 1583712000. Its totient is φ = 1006454592.

The previous prime is 1288790611. The next prime is 1288790669. The reversal of 1288790665 is 5660978821.

It is a cyclic number.

It is not a de Polignac number, because 1288790665 - 2¹⁹ = 1288266377 is a prime.

It is a super-2 number, since 2×1288790665² = 3321962756382284450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1288790669) 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, 40516 + ... + 64954.

It is an arithmetic number, because the mean of its divisors is an integer number (98982000).

Almost surely, 2^1288790665 is an apocalyptic number.

It is an amenable number.

1288790665 is a deficient number, since it is larger than the sum of its proper divisors (294921335).

1288790665 is a wasteful number, since it uses less digits than its factorization.

1288790665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24696.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The square root of 1288790665 is about 35899.7307092964. The cubic root of 1288790665 is about 1088.2469548383.

The spelling of 1288790665 in words is "one billion, two hundred eighty-eight million, seven hundred ninety thousand, six hundred sixty-five".