1288648636 has 24 divisors (see below), whose sum is σ = 2461092480. Its totient is φ = 585524400.

The previous prime is 1288648561. The next prime is 1288648661. The reversal of 1288648636 is 6368468821.

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 7 ways as a sum of consecutive naturals, for example, 176425 + ... + 183583.

It is an arithmetic number, because the mean of its divisors is an integer number (102545520).

Almost surely, 2^1288648636 is an apocalyptic number.

It is an amenable number.

1288648636 is a deficient number, since it is larger than the sum of its proper divisors (1172443844).

1288648636 is a wasteful number, since it uses less digits than its factorization.

1288648636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11265 (or 11263 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 52.

The square root of 1288648636 is about 35897.7525201788. The cubic root of 1288648636 is about 1088.2069772301.

The spelling of 1288648636 in words is "one billion, two hundred eighty-eight million, six hundred forty-eight thousand, six hundred thirty-six".