1265728687 has 2 divisors, whose sum is σ = 1265728688. Its totient is φ = 1265728686.

The previous prime is 1265728657. The next prime is 1265728697. The reversal of 1265728687 is 7868275621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1265728687 - 2⁷ = 1265728559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265728657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632864343 + 632864344.

It is an arithmetic number, because the mean of its divisors is an integer number (632864344).

Almost surely, 2^1265728687 is an apocalyptic number.

1265728687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265728687 is an equidigital number, since it uses as much as digits as its factorization.

1265728687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 52.

The square root of 1265728687 is about 35577.0809229762. The cubic root of 1265728687 is about 1081.7167161893.

The spelling of 1265728687 in words is "one billion, two hundred sixty-five million, seven hundred twenty-eight thousand, six hundred eighty-seven".