228138860 has 24 divisors (see below), whose sum is σ = 479966256. Its totient is φ = 91088960.

The previous prime is 228138847. The next prime is 228138887. The reversal of 228138860 is 68831822.

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, 1130 + ... + 21390.

It is an arithmetic number, because the mean of its divisors is an integer number (19998594).

Almost surely, 2^228138860 is an apocalyptic number.

228138860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228138860 is an abundant number, since it is smaller than the sum of its proper divisors (251827396).

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

228138860 is a wasteful number, since it uses less digits than its factorization.

228138860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20833 (or 20831 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 228138860 is about 15104.2662847290. The cubic root of 228138860 is about 611.0354714340.

The spelling of 228138860 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, eight hundred sixty".