228788 has 12 divisors (see below), whose sum is σ = 457632. Its totient is φ = 98040.
The previous prime is 228773. The next prime is 228793. The reversal of 228788 is 887822.
228788 is an admirable number.
It is a congruent number.
It is an unprimeable number.
228788 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 3 ways as a sum of consecutive naturals, for example, 4058 + ... + 4113.
It is an arithmetic number, because the mean of its divisors is an integer number (38136).
2228788 is an apocalyptic number.
228788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.
It is an amenable number.
228788 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
228788 is a wasteful number, since it uses less digits than its factorization.
228788 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 8182 (or 8180 counting only the distinct ones).
The product of its digits is 14336, while the sum is 35.
The square root of 228788 is about 478.3178859294. The cubic root of 228788 is about 61.1614463772.
The spelling of 228788 in words is "two hundred twenty-eight thousand, seven hundred eighty-eight".
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