1318779660 has 96 divisors (see below), whose sum is σ = 4036419072. Its totient is φ = 319057920.

The previous prime is 1318779659. The next prime is 1318779667. The reversal of 1318779660 is 669778131.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1318779667) 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 31 ways as a sum of consecutive naturals, for example, 379089 + ... + 382551.

It is an arithmetic number, because the mean of its divisors is an integer number (42046032).

Almost surely, 2^1318779660 is an apocalyptic number.

1318779660 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 1318779660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2018209536).

1318779660 is an abundant number, since it is smaller than the sum of its proper divisors (2717639412).

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

1318779660 is a wasteful number, since it uses less digits than its factorization.

1318779660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4063 (or 4061 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 1318779660 is about 36315.0059892601. The cubic root of 1318779660 is about 1096.6231593477.

The spelling of 1318779660 in words is "one billion, three hundred eighteen million, seven hundred seventy-nine thousand, six hundred sixty".