1255217678 has 64 divisors (see below), whose sum is σ = 2351462400. Its totient is φ = 493708800.

The previous prime is 1255217659. The next prime is 1255217741. The reversal of 1255217678 is 8767125521.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2095223 + ... + 2095821.

It is an arithmetic number, because the mean of its divisors is an integer number (36741600).

Almost surely, 2^1255217678 is an apocalyptic number.

1255217678 is a deficient number, since it is larger than the sum of its proper divisors (1096244722).

1255217678 is a wasteful number, since it uses less digits than its factorization.

1255217678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073.

The product of its digits is 235200, while the sum is 44.

The square root of 1255217678 is about 35429.0513279709. The cubic root of 1255217678 is about 1078.7140839411.

The spelling of 1255217678 in words is "one billion, two hundred fifty-five million, two hundred seventeen thousand, six hundred seventy-eight".