217728275 has 12 divisors (see below), whose sum is σ = 270196992. Its totient is φ = 174044640.

The previous prime is 217728257. The next prime is 217728289. The reversal of 217728275 is 572827712.

217728275 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-217728275 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38957 + ... + 44193.

It is an arithmetic number, because the mean of its divisors is an integer number (22516416).

Almost surely, 2^217728275 is an apocalyptic number.

217728275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

217728275 is a deficient number, since it is larger than the sum of its proper divisors (52468717).

217728275 is a wasteful number, since it uses less digits than its factorization.

217728275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6910 (or 6905 counting only the distinct ones).

The product of its digits is 109760, while the sum is 41.

The square root of 217728275 is about 14755.6184214692. The cubic root of 217728275 is about 601.5960054762.

The spelling of 217728275 in words is "two hundred seventeen million, seven hundred twenty-eight thousand, two hundred seventy-five".