217064438 has 8 divisors (see below), whose sum is σ = 325669680. Its totient is φ = 108507880.

The previous prime is 217064423. The next prime is 217064461. The reversal of 217064438 is 834460712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 217064398 and 217064407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2528 + ... + 20988.

It is an arithmetic number, because the mean of its divisors is an integer number (40708710).

Almost surely, 2^217064438 is an apocalyptic number.

217064438 is a deficient number, since it is larger than the sum of its proper divisors (108605242).

217064438 is a wasteful number, since it uses less digits than its factorization.

217064438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24342.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 217064438 is about 14733.1068685461. The cubic root of 217064438 is about 600.9839761768.

The spelling of 217064438 in words is "two hundred seventeen million, sixty-four thousand, four hundred thirty-eight".