1317218320 has 80 divisors (see below), whose sum is σ = 3516828480. Its totient is φ = 453772800.

The previous prime is 1317218299. The next prime is 1317218333. The reversal of 1317218320 is 238127131.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22671 + ... + 56110.

It is an arithmetic number, because the mean of its divisors is an integer number (43960356).

Almost surely, 2^1317218320 is an apocalyptic number.

1317218320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1317218320 is an abundant number, since it is smaller than the sum of its proper divisors (2199610160).

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

1317218320 is a wasteful number, since it uses less digits than its factorization.

1317218320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78824 (or 78818 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1317218320 is about 36293.5024487855. The cubic root of 1317218320 is about 1096.1902142020.

It can be divided in two parts, 131721 and 8320, that added together give a palindrome (140041).

The spelling of 1317218320 in words is "one billion, three hundred seventeen million, two hundred eighteen thousand, three hundred twenty".