1318289664 has 72 divisors (see below), whose sum is σ = 3551016672. Its totient is φ = 434114560.

The previous prime is 1318289659. The next prime is 1318289719. The reversal of 1318289664 is 4669828131.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53404 + ... + 74084.

It is an arithmetic number, because the mean of its divisors is an integer number (49319676).

Almost surely, 2^1318289664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1318289664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1775508336).

1318289664 is an abundant number, since it is smaller than the sum of its proper divisors (2232727008).

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

1318289664 is an equidigital number, since it uses as much as digits as its factorization.

1318289664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20783 (or 20769 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 1318289664 is about 36308.2588951880. The cubic root of 1318289664 is about 1096.4873247976.

The spelling of 1318289664 in words is "one billion, three hundred eighteen million, two hundred eighty-nine thousand, six hundred sixty-four".