1268512605 has 24 divisors (see below), whose sum is σ = 2228880888. Its totient is φ = 667270656.

The previous prime is 1268512601. The next prime is 1268512607. The reversal of 1268512605 is 5062158621.

It can be written as a sum of positive squares in 4 ways, for example, as 82192356 + 1186320249 = 9066^2 + 34443^2 .

It is not a de Polignac number, because 1268512605 - 2² = 1268512601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1268512605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268512601) 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, 189792 + ... + 196361.

It is an arithmetic number, because the mean of its divisors is an integer number (92870037).

Almost surely, 2^1268512605 is an apocalyptic number.

1268512605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1268512605 is a deficient number, since it is larger than the sum of its proper divisors (960368283).

1268512605 is a wasteful number, since it uses less digits than its factorization.

1268512605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386237 (or 386234 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 1268512605 is about 35616.1845935243. The cubic root of 1268512605 is about 1082.5091992171.

The spelling of 1268512605 in words is "one billion, two hundred sixty-eight million, five hundred twelve thousand, six hundred five".