217715423808 has 56 divisors (see below), whose sum is σ = 590088471840. Its totient is φ = 70801761280.

The previous prime is 217715423759. The next prime is 217715423843. The reversal of 217715423808 is 808324517712.

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

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13820598 + ... + 13836341.

It is an arithmetic number, because the mean of its divisors is an integer number (10537294140).

Almost surely, 2^217715423808 is an apocalyptic number.

It is an amenable number.

217715423808 is an abundant number, since it is smaller than the sum of its proper divisors (372373048032).

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

217715423808 is a wasteful number, since it uses less digits than its factorization.

217715423808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27656995 (or 27656985 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 48.

The spelling of 217715423808 in words is "two hundred seventeen billion, seven hundred fifteen million, four hundred twenty-three thousand, eight hundred eight".