Base | Representation |
---|---|
bin | 110101011110… |
… | …1011100111100 |
3 | 1221202112020110 |
4 | 1222331130330 |
5 | 24134221342 |
6 | 2440550020 |
7 | 460220163 |
oct | 152753474 |
9 | 57675213 |
10 | 28038972 |
11 | 14911105 |
12 | 9482310 |
13 | 5a69510 |
14 | 3a1c3da |
15 | 26dcc9c |
hex | 1abd73c |
28038972 has 24 divisors (see below), whose sum is σ = 70457296. Its totient is φ = 8627328.
The previous prime is 28038971. The next prime is 28038979. The reversal of 28038972 is 27983082.
It is a Harshad number since it is a multiple of its sum of digits (39).
It is a self number, because there is not a number n which added to its sum of digits gives 28038972.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (28038971) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89713 + ... + 90024.
Almost surely, 228038972 is an apocalyptic number.
It is an amenable number.
28038972 is an abundant number, since it is smaller than the sum of its proper divisors (42418324).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
28038972 is a wasteful number, since it uses less digits than its factorization.
28038972 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 179757 (or 179755 counting only the distinct ones).
The product of its (nonzero) digits is 48384, while the sum is 39.
The square root of 28038972 is about 5295.1838494995. The cubic root of 28038972 is about 303.7997151433.
The spelling of 28038972 in words is "twenty-eight million, thirty-eight thousand, nine hundred seventy-two".
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