1261678568 has 32 divisors (see below), whose sum is σ = 2469103560. Its totient is φ = 603832320.

The previous prime is 1261678549. The next prime is 1261678589. The reversal of 1261678568 is 8658761621.

It can be written as a sum of positive squares in 4 ways, for example, as 602113444 + 659565124 = 24538^2 + 25682^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18905 + ... + 53672.

Almost surely, 2^1261678568 is an apocalyptic number.

It is an amenable number.

1261678568 is a deficient number, since it is larger than the sum of its proper divisors (1207424992).

1261678568 is a wasteful number, since it uses less digits than its factorization.

1261678568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72677 (or 72673 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The square root of 1261678568 is about 35520.1149772914. The cubic root of 1261678568 is about 1080.5617128297.

The spelling of 1261678568 in words is "one billion, two hundred sixty-one million, six hundred seventy-eight thousand, five hundred sixty-eight".