Base | Representation |
---|---|
bin | 111010010101… |
… | …0001110111001 |
3 | 2010112201012011 |
4 | 1310222032321 |
5 | 30312103224 |
6 | 3011245521 |
7 | 520640305 |
oct | 164521671 |
9 | 63481164 |
10 | 30581689 |
11 | 16298526 |
12 | a2a98a1 |
13 | 6449998 |
14 | 40c0d05 |
15 | 2a41394 |
hex | 1d2a3b9 |
30581689 has 16 divisors (see below), whose sum is σ = 32717520. Its totient is φ = 28537600.
The previous prime is 30581669. The next prime is 30581699. The reversal of 30581689 is 98618503.
It is a happy number.
It can be written as a sum of positive squares in 8 ways, for example, as 13935289 + 16646400 = 3733^2 + 4080^2 .
It is a cyclic number.
It is not a de Polignac number, because 30581689 - 27 = 30581561 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (30581669) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155139 + ... + 155335.
It is an arithmetic number, because the mean of its divisors is an integer number (2044845).
It is the magic constant of a 394 × 394 magic square.
Almost surely, 230581689 is an apocalyptic number.
It is an amenable number.
30581689 is a deficient number, since it is larger than the sum of its proper divisors (2135831).
30581689 is a wasteful number, since it uses less digits than its factorization.
30581689 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 380.
The product of its (nonzero) digits is 51840, while the sum is 40.
The square root of 30581689 is about 5530.0713376954. The cubic root of 30581689 is about 312.7186787257.
The spelling of 30581689 in words is "thirty million, five hundred eighty-one thousand, six hundred eighty-nine".
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