1266791288 has 64 divisors (see below), whose sum is σ = 2770891200. Its totient is φ = 531763200.

The previous prime is 1266791233. The next prime is 1266791291. The reversal of 1266791288 is 8821976621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 547478 + ... + 549786.

It is an arithmetic number, because the mean of its divisors is an integer number (43295175).

Almost surely, 2^1266791288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266791288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1385445600).

1266791288 is an abundant number, since it is smaller than the sum of its proper divisors (1504099912).

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

1266791288 is a wasteful number, since it uses less digits than its factorization.

1266791288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2520 (or 2516 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 1266791288 is about 35592.0115756331. The cubic root of 1266791288 is about 1082.0193381150.

The spelling of 1266791288 in words is "one billion, two hundred sixty-six million, seven hundred ninety-one thousand, two hundred eighty-eight".