1278087563 has 4 divisors (see below), whose sum is σ = 1280243448. Its totient is φ = 1275931680.

The previous prime is 1278087553. The next prime is 1278087571. The reversal of 1278087563 is 3657808721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1278087563 - 2¹² = 1278083467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278087553) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1077053 + ... + 1078238.

It is an arithmetic number, because the mean of its divisors is an integer number (320060862).

Almost surely, 2^1278087563 is an apocalyptic number.

1278087563 is a deficient number, since it is larger than the sum of its proper divisors (2155885).

1278087563 is an equidigital number, since it uses as much as digits as its factorization.

1278087563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155884.

The product of its (nonzero) digits is 564480, while the sum is 47.

The square root of 1278087563 is about 35750.3505297501. The cubic root of 1278087563 is about 1085.2260320355.

The spelling of 1278087563 in words is "one billion, two hundred seventy-eight million, eighty-seven thousand, five hundred sixty-three".