228638788 has 12 divisors (see below), whose sum is σ = 457277632. Its totient is φ = 97988040.

The previous prime is 228638779. The next prime is 228638807. The reversal of 228638788 is 887836822.

228638788 is an admirable 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, 4082808 + ... + 4082863.

Almost surely, 2^228638788 is an apocalyptic number.

228638788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

228638788 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.

228638788 is a wasteful number, since it uses less digits than its factorization.

228638788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8165682 (or 8165680 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 52.

The square root of 228638788 is about 15120.8064599743. The cubic root of 228638788 is about 611.4814730211.

The spelling of 228638788 in words is "two hundred twenty-eight million, six hundred thirty-eight thousand, seven hundred eighty-eight".