318644387388 has 18 divisors (see below), whose sum is σ = 805462201544. Its totient is φ = 106214795784.

The previous prime is 318644387359. The next prime is 318644387419. The reversal of 318644387388 is 883783446813.

318644387388 is a `hidden beast` number, since 3 + 1 + 86 + 443 + 87 + 38 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×318644387388² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4425616456 + ... + 4425616527.

Almost surely, 2^318644387388 is an apocalyptic number.

It is an amenable number.

318644387388 is an abundant number, since it is smaller than the sum of its proper divisors (486817814156).

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

318644387388 is a wasteful number, since it uses less digits than its factorization.

318644387388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8851232993 (or 8851232988 counting only the distinct ones).

The product of its digits is 74317824, while the sum is 63.

The spelling of 318644387388 in words is "three hundred eighteen billion, six hundred forty-four million, three hundred eighty-seven thousand, three hundred eighty-eight".