1268311887 has 24 divisors (see below), whose sum is σ = 1861913664. Its totient is φ = 831849984.

The previous prime is 1268311861. The next prime is 1268311907. The reversal of 1268311887 is 7881138621.

It is a happy number.

It is not a de Polignac number, because 1268311887 - 2⁶ = 1268311823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268312887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134778 + ... + 143880.

It is an arithmetic number, because the mean of its divisors is an integer number (77579736).

Almost surely, 2^1268311887 is an apocalyptic number.

1268311887 is a deficient number, since it is larger than the sum of its proper divisors (593601777).

1268311887 is a wasteful number, since it uses less digits than its factorization.

1268311887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9359 (or 9356 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 1268311887 is about 35613.3666900505. The cubic root of 1268311887 is about 1082.4521007061.

The spelling of 1268311887 in words is "one billion, two hundred sixty-eight million, three hundred eleven thousand, eight hundred eighty-seven".