1288787664 has 40 divisors (see below), whose sum is σ = 3331717312. Its totient is φ = 429292800.

The previous prime is 1288787653. The next prime is 1288787671. The reversal of 1288787664 is 4667878821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65364 + ... + 82764.

Almost surely, 2^1288787664 is an apocalyptic number.

It is an amenable number.

1288787664 is an abundant number, since it is smaller than the sum of its proper divisors (2042929648).

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

1288787664 is a wasteful number, since it uses less digits than its factorization.

1288787664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18955 (or 18949 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 57.

The square root of 1288787664 is about 35899.6889123012. The cubic root of 1288787664 is about 1088.2461101623.

The spelling of 1288787664 in words is "one billion, two hundred eighty-eight million, seven hundred eighty-seven thousand, six hundred sixty-four".