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228145148 = 22711732139
BaseRepresentation
bin11011001100100…
…11011111111100
3120220021222022022
431212103133330
5431401121043
634345535312
75440126130
oct1546233774
9526258268
10228145148
11107866910
12644a4538
133835cc3a
142242b3c0
1515068868
hexd9937fc

228145148 has 72 divisors (see below), whose sum is σ = 508314240. Its totient is φ = 87039360.

The previous prime is 228145123. The next prime is 228145187. The reversal of 228145148 is 841541822.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1641263 + ... + 1641401.

It is an arithmetic number, because the mean of its divisors is an integer number (7059920).

Almost surely, 2228145148 is an apocalyptic number.

228145148 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228145148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254157120).

228145148 is an abundant number, since it is smaller than the sum of its proper divisors (280169092).

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

228145148 is a wasteful number, since it uses less digits than its factorization.

228145148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 232 counting only the distinct ones).

The product of its digits is 20480, while the sum is 35.

The square root of 228145148 is about 15104.4744364046. The cubic root of 228145148 is about 611.0410852018.

The spelling of 228145148 in words is "two hundred twenty-eight million, one hundred forty-five thousand, one hundred forty-eight".