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228872172 = 223232333559
BaseRepresentation
bin11011010010001…
…00111111101100
3120221122220121010
431221010333230
5432042402142
634413305220
75446244544
oct1551047754
9527586533
10228872172
11108213061
1264795210
1338555b29
142257a324
151515de9c
hexda44fec

228872172 has 48 divisors (see below), whose sum is σ = 559802880. Its totient is φ = 72640128.

The previous prime is 228872153. The next prime is 228872197. The reversal of 228872172 is 271278822.

It is a super-2 number, since 2×2288721722 = 104764942231995168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 228872172.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62529 + ... + 66087.

It is an arithmetic number, because the mean of its divisors is an integer number (11662560).

Almost surely, 2228872172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228872172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279901440).

228872172 is an abundant number, since it is smaller than the sum of its proper divisors (330930708).

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

228872172 is a wasteful number, since it uses less digits than its factorization.

228872172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822 (or 3820 counting only the distinct ones).

The product of its digits is 50176, while the sum is 39.

The square root of 228872172 is about 15128.5218048559. The cubic root of 228872172 is about 611.6894596939.

The spelling of 228872172 in words is "two hundred twenty-eight million, eight hundred seventy-two thousand, one hundred seventy-two".

Divisors: 1 2 3 4 6 12 23 46 69 92 138 233 276 466 699 932 1398 2796 3559 5359 7118 10677 10718 14236 16077 21354 21436 32154 42708 64308 81857 163714 245571 327428 491142 829247 982284 1658494 2487741 3316988 4975482 9950964 19072681 38145362 57218043 76290724 114436086 228872172