218309887408 has 40 divisors (see below), whose sum is σ = 437755888080. Its totient is φ = 105343983360.

The previous prime is 218309887391. The next prime is 218309887447. The reversal of 218309887408 is 804788903812.

It is a Harshad number since it is a multiple of its sum of digits (58).

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, 948118 + ... + 1155658.

It is an arithmetic number, because the mean of its divisors is an integer number (10943897202).

Almost surely, 2^218309887408 is an apocalyptic number.

It is an amenable number.

218309887408 is an abundant number, since it is smaller than the sum of its proper divisors (219446000672).

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

218309887408 is a wasteful number, since it uses less digits than its factorization.

218309887408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209845 (or 209839 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 58.

The spelling of 218309887408 in words is "two hundred eighteen billion, three hundred nine million, eight hundred eighty-seven thousand, four hundred eight".