318747985920 has 1920 divisors, whose sum is σ = 1454424491520. Its totient is φ = 64975011840.

The previous prime is 318747985783. The next prime is 318747985939. The reversal of 318747985920 is 29589747813.

318747985920 is a `hidden beast` number, since 3 + 1 + 87 + 479 + 85 + 9 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1920).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3094640589 + ... + 3094640691.

It is an arithmetic number, because the mean of its divisors is an integer number (757512756).

Almost surely, 2^318747985920 is an apocalyptic number.

318747985920 is a gapful number since it is divisible by the number (30) 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 318747985920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (727212245760).

318747985920 is an abundant number, since it is smaller than the sum of its proper divisors (1135676505600).

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

318747985920 is a wasteful number, since it uses less digits than its factorization.

318747985920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 63.

The spelling of 318747985920 in words is "three hundred eighteen billion, seven hundred forty-seven million, nine hundred eighty-five thousand, nine hundred twenty".