1291762668 has 48 divisors (see below), whose sum is σ = 3450585600. Its totient is φ = 368444544.

The previous prime is 1291762627. The next prime is 1291762669. The reversal of 1291762668 is 8662671921.

It is not an unprimeable number, because it can be changed into a prime (1291762669) 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, 37480 + ... + 63152.

It is an arithmetic number, because the mean of its divisors is an integer number (71887200).

Almost surely, 2^1291762668 is an apocalyptic number.

It is an amenable number.

1291762668 is an abundant number, since it is smaller than the sum of its proper divisors (2158822932).

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

1291762668 is a wasteful number, since it uses less digits than its factorization.

1291762668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26286 (or 26284 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 1291762668 is about 35941.0999831669. The cubic root of 1291762668 is about 1089.0828263679.

The spelling of 1291762668 in words is "one billion, two hundred ninety-one million, seven hundred sixty-two thousand, six hundred sixty-eight".