216708128 has 48 divisors (see below), whose sum is σ = 525107520. Its totient is φ = 85729536.

The previous prime is 216708119. The next prime is 216708157. The reversal of 216708128 is 821807612.

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, 34298 + ... + 40121.

It is an arithmetic number, because the mean of its divisors is an integer number (10939740).

Almost surely, 2^216708128 is an apocalyptic number.

216708128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216708128 is an abundant number, since it is smaller than the sum of its proper divisors (308399392).

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

216708128 is a wasteful number, since it uses less digits than its factorization.

216708128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74449 (or 74441 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 216708128 is about 14721.0097479759. The cubic root of 216708128 is about 600.6549588621.

The spelling of 216708128 in words is "two hundred sixteen million, seven hundred eight thousand, one hundred twenty-eight".