1268909287 has 16 divisors (see below), whose sum is σ = 1375028928. Its totient is φ = 1167851520.

The previous prime is 1268909263. The next prime is 1268909303. The reversal of 1268909287 is 7829098621.

It is a cyclic number.

It is not a de Polignac number, because 1268909287 - 2¹¹ = 1268907239 is a prime.

It is a super-2 number, since 2×1268909287² = 3220261557269696738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268909227) 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, 59623 + ... + 78055.

It is an arithmetic number, because the mean of its divisors is an integer number (85939308).

Almost surely, 2^1268909287 is an apocalyptic number.

1268909287 is a deficient number, since it is larger than the sum of its proper divisors (106119641).

1268909287 is a wasteful number, since it uses less digits than its factorization.

1268909287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18570.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 1268909287 is about 35621.7530029054. The cubic root of 1268909287 is about 1082.6220261503.

The spelling of 1268909287 in words is "one billion, two hundred sixty-eight million, nine hundred nine thousand, two hundred eighty-seven".