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216888 = 23371291
BaseRepresentation
bin110100111100111000
3102000111220
4310330320
523420023
64352040
71562220
oct647470
9360456
10216888
11138a51
12a5620
1377949
1459080
15443e3
hex34f38

216888 has 32 divisors (see below), whose sum is σ = 620160. Its totient is φ = 61920.

The previous prime is 216877. The next prime is 216899. The reversal of 216888 is 888612.

It is an interprime number because it is at equal distance from previous prime (216877) and next prime (216899).

It is a nude number because it is divisible by every one of its digits.

216888 is a modest number, since divided by 888 gives 216 as remainder.

It is a congruent number.

It is an unprimeable number.

216888 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478 + ... + 813.

It is an arithmetic number, because the mean of its divisors is an integer number (19380).

2216888 is an apocalyptic number.

216888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216888 is an abundant number, since it is smaller than the sum of its proper divisors (403272).

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

216888 is a wasteful number, since it uses less digits than its factorization.

216888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307 (or 1303 counting only the distinct ones).

The product of its digits is 6144, while the sum is 33.

The square root of 216888 is about 465.7123575771. The cubic root of 216888 is about 60.0821098040.

The spelling of 216888 in words is "two hundred sixteen thousand, eight hundred eighty-eight".

Divisors: 1 2 3 4 6 7 8 12 14 21 24 28 42 56 84 168 1291 2582 3873 5164 7746 9037 10328 15492 18074 27111 30984 36148 54222 72296 108444 216888