1268789668 has 6 divisors (see below), whose sum is σ = 2220381926. Its totient is φ = 634394832.

The previous prime is 1268789659. The next prime is 1268789677. The reversal of 1268789668 is 8669878621.

It is an interprime number because it is at equal distance from previous prime (1268789659) and next prime (1268789677).

It can be written as a sum of positive squares in only one way, i.e., 878648164 + 390141504 = 29642^2 + 19752^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158598705 + ... + 158598712.

Almost surely, 2^1268789668 is an apocalyptic number.

It is an amenable number.

1268789668 is a deficient number, since it is larger than the sum of its proper divisors (951592258).

1268789668 is a wasteful number, since it uses less digits than its factorization.

1268789668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317197421 (or 317197419 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 61.

The square root of 1268789668 is about 35620.0739471439. The cubic root of 1268789668 is about 1082.5880057951.

The spelling of 1268789668 in words is "one billion, two hundred sixty-eight million, seven hundred eighty-nine thousand, six hundred sixty-eight".