217640359328 has 48 divisors (see below), whose sum is σ = 490035651840. Its totient is φ = 93208755456.

The previous prime is 217640359297. The next prime is 217640359331. The reversal of 217640359328 is 823953046712.

It is a super-2 number, since 2×217640359328² (a number of 23 digits) contains 22 as substring.

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, 22643 + ... + 660146.

It is an arithmetic number, because the mean of its divisors is an integer number (10209076080).

It is a 1-persistent number, because it is pandigital, but 2⋅217640359328 = 435280718656 is not.

Almost surely, 2^217640359328 is an apocalyptic number.

217640359328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

217640359328 is an abundant number, since it is smaller than the sum of its proper divisors (272395292512).

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

217640359328 is a wasteful number, since it uses less digits than its factorization.

217640359328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684229 (or 684221 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 217640359328 in words is "two hundred seventeen billion, six hundred forty million, three hundred fifty-nine thousand, three hundred twenty-eight".