217920328 has 32 divisors (see below), whose sum is σ = 424224000. Its totient is φ = 104834880.

The previous prime is 217920317. The next prime is 217920337. The reversal of 217920328 is 823029712.

It is a junction number, because it is equal to n+sod(n) for n = 217920293 and 217920302.

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, 41938 + ... + 46846.

It is an arithmetic number, because the mean of its divisors is an integer number (13257000).

Almost surely, 2^217920328 is an apocalyptic number.

It is an amenable number.

217920328 is a deficient number, since it is larger than the sum of its proper divisors (206303672).

217920328 is a wasteful number, since it uses less digits than its factorization.

217920328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5125 (or 5121 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 217920328 is about 14762.1247793128. The cubic root of 217920328 is about 601.7728380643.

The spelling of 217920328 in words is "two hundred seventeen million, nine hundred twenty thousand, three hundred twenty-eight".