1285256678 has 16 divisors (see below), whose sum is σ = 2079807840. Its totient is φ = 593414016.

The previous prime is 1285256671. The next prime is 1285256701. The reversal of 1285256678 is 8766525821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285256671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354818 + ... + 358421.

It is an arithmetic number, because the mean of its divisors is an integer number (129987990).

Almost surely, 2^1285256678 is an apocalyptic number.

1285256678 is a deficient number, since it is larger than the sum of its proper divisors (794551162).

1285256678 is a wasteful number, since it uses less digits than its factorization.

1285256678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713311.

The product of its digits is 1612800, while the sum is 50.

The square root of 1285256678 is about 35850.4766774446. The cubic root of 1285256678 is about 1087.2513519344.

The spelling of 1285256678 in words is "one billion, two hundred eighty-five million, two hundred fifty-six thousand, six hundred seventy-eight".