1295778687 has 12 divisors (see below), whose sum is σ = 2009779416. Its totient is φ = 740444880.

The previous prime is 1295778683. The next prime is 1295778697. The reversal of 1295778687 is 7868775921.

It is not a de Polignac number, because 1295778687 - 2² = 1295778683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1295778687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1295778683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4407264 + ... + 4407557.

It is an arithmetic number, because the mean of its divisors is an integer number (167481618).

Almost surely, 2^1295778687 is an apocalyptic number.

1295778687 is a deficient number, since it is larger than the sum of its proper divisors (714000729).

1295778687 is an equidigital number, since it uses as much as digits as its factorization.

1295778687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8814838 (or 8814831 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 60.

The square root of 1295778687 is about 35996.9260770972. The cubic root of 1295778687 is about 1090.2102916093.

The spelling of 1295778687 in words is "one billion, two hundred ninety-five million, seven hundred seventy-eight thousand, six hundred eighty-seven".