1288735660 has 48 divisors (see below), whose sum is σ = 2882827584. Its totient is φ = 482244608.

The previous prime is 1288735639. The next prime is 1288735663. The reversal of 1288735660 is 665378821.

It is a self number, because there is not a number n which added to its sum of digits gives 1288735660.

It is not an unprimeable number, because it can be changed into a prime (1288735663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45432 + ... + 68128.

It is an arithmetic number, because the mean of its divisors is an integer number (60058908).

Almost surely, 2^1288735660 is an apocalyptic number.

1288735660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1288735660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441413792).

1288735660 is an abundant number, since it is smaller than the sum of its proper divisors (1594091924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1288735660 is a wasteful number, since it uses less digits than its factorization.

1288735660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22890 (or 22888 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 1288735660 is about 35898.9646090246. The cubic root of 1288735660 is about 1088.2314726562.

The spelling of 1288735660 in words is "one billion, two hundred eighty-eight million, seven hundred thirty-five thousand, six hundred sixty".