1317798720 has 448 divisors, whose sum is σ = 5398617600. Its totient is φ = 300091392.

The previous prime is 1317798709. The next prime is 1317798721. The reversal of 1317798720 is 278977131.

It is a tau number, because it is divible by the number of its divisors (448).

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

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317798721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4898746 + ... + 4899014.

Almost surely, 2^1317798720 is an apocalyptic number.

1317798720 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 1317798720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2699308800).

1317798720 is an abundant number, since it is smaller than the sum of its proper divisors (4080818880).

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

1317798720 is an frugal number, since it uses more digits than its factorization.

1317798720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The square root of 1317798720 is about 36301.4974897731. The cubic root of 1317798720 is about 1096.3511936861.

The spelling of 1317798720 in words is "one billion, three hundred seventeen million, seven hundred ninety-eight thousand, seven hundred twenty".