1317272778 has 48 divisors (see below), whose sum is σ = 3028124736. Its totient is φ = 412421760.

The previous prime is 1317272773. The next prime is 1317272791. The reversal of 1317272778 is 8772727131.

It is not an unprimeable number, because it can be changed into a prime (1317272773) 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 23 ways as a sum of consecutive naturals, for example, 155923 + ... + 164153.

It is an arithmetic number, because the mean of its divisors is an integer number (63085932).

Almost surely, 2^1317272778 is an apocalyptic number.

1317272778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1317272778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1514062368).

1317272778 is an abundant number, since it is smaller than the sum of its proper divisors (1710851958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1317272778 is a wasteful number, since it uses less digits than its factorization.

1317272778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8779 (or 8776 counting only the distinct ones).

The product of its digits is 230496, while the sum is 45.

The square root of 1317272778 is about 36294.2526855148. The cubic root of 1317272778 is about 1096.2053206585.

The spelling of 1317272778 in words is "one billion, three hundred seventeen million, two hundred seventy-two thousand, seven hundred seventy-eight".