1288765264 has 20 divisors (see below), whose sum is σ = 2497691700. Its totient is φ = 644199680.

The previous prime is 1288765253. The next prime is 1288765267. The reversal of 1288765264 is 4625678821.

It can be written as a sum of positive squares in 2 ways, for example, as 693795600 + 594969664 = 26340^2 + 24392^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288765267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60324 + ... + 78844.

It is an arithmetic number, because the mean of its divisors is an integer number (124884585).

Almost surely, 2^1288765264 is an apocalyptic number.

It is an amenable number.

1288765264 is a deficient number, since it is larger than the sum of its proper divisors (1208926436).

1288765264 is a wasteful number, since it uses less digits than its factorization.

1288765264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22878 (or 22872 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 49.

The square root of 1288765264 is about 35899.3769305262. The cubic root of 1288765264 is about 1088.2398053083.

The spelling of 1288765264 in words is "one billion, two hundred eighty-eight million, seven hundred sixty-five thousand, two hundred sixty-four".