1268978559 has 8 divisors (see below), whose sum is σ = 1693119792. Its totient is φ = 845411520.

The previous prime is 1268978537. The next prime is 1268978561. The reversal of 1268978559 is 9558798621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1268978559 - 2⁹ = 1268978047 is a prime.

It is a super-3 number, since 3×1268978559³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268978519) 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, 138364 + ... + 147249.

It is an arithmetic number, because the mean of its divisors is an integer number (211639974).

Almost surely, 2^1268978559 is an apocalyptic number.

1268978559 is a deficient number, since it is larger than the sum of its proper divisors (424141233).

1268978559 is a wasteful number, since it uses less digits than its factorization.

1268978559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287097.

The product of its digits is 10886400, while the sum is 60.

The square root of 1268978559 is about 35622.7253168536. The cubic root of 1268978559 is about 1082.6417265415.

The spelling of 1268978559 in words is "one billion, two hundred sixty-eight million, nine hundred seventy-eight thousand, five hundred fifty-nine".