1317778560 has 768 divisors, whose sum is σ = 5728320000. Its totient is φ = 278175744.

The previous prime is 1317778529. The next prime is 1317778727. The reversal of 1317778560 is 658777131.

1317778560 is a `hidden beast` number, since 1 + 3 + 17 + 7 + 78 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 95 ways as a sum of consecutive naturals, for example, 45440626 + ... + 45440654.

It is an arithmetic number, because the mean of its divisors is an integer number (7458750).

Almost surely, 2^1317778560 is an apocalyptic number.

1317778560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1317778560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2864160000).

1317778560 is an abundant number, since it is smaller than the sum of its proper divisors (4410541440).

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

1317778560 is a wasteful number, since it uses less digits than its factorization.

1317778560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 1317778560 is about 36301.2198142156. The cubic root of 1317778560 is about 1096.3456029100.

The spelling of 1317778560 in words is "one billion, three hundred seventeen million, seven hundred seventy-eight thousand, five hundred sixty".