1266787944 has 64 divisors (see below), whose sum is σ = 3613982400. Its totient is φ = 410847552.

The previous prime is 1266787943. The next prime is 1266787967. The reversal of 1266787944 is 4497876621.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1266787943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71262 + ... + 87245.

It is an arithmetic number, because the mean of its divisors is an integer number (56468475).

Almost surely, 2^1266787944 is an apocalyptic number.

It is an amenable number.

1266787944 is an abundant number, since it is smaller than the sum of its proper divisors (2347194456).

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

1266787944 is a wasteful number, since it uses less digits than its factorization.

1266787944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158559 (or 158549 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 1266787944 is about 35591.9645987686. The cubic root of 1266787944 is about 1082.0183860308.

The spelling of 1266787944 in words is "one billion, two hundred sixty-six million, seven hundred eighty-seven thousand, nine hundred forty-four".