Base | Representation |
---|---|
bin | 1001101100001… |
… | …10011001010011 |
3 | 12122222000001200 |
4 | 10312012121103 |
5 | 131302301320 |
6 | 12022202243 |
7 | 2004650343 |
oct | 466063123 |
9 | 178860050 |
10 | 81290835 |
11 | 4198300a |
12 | 23283383 |
13 | 13ac2ab2 |
14 | ab20d23 |
15 | 720b290 |
hex | 4d86653 |
81290835 has 48 divisors (see below), whose sum is σ = 153154560. Its totient is φ = 39735360.
The previous prime is 81290827. The next prime is 81290843. The reversal of 81290835 is 53809218.
It is an interprime number because it is at equal distance from previous prime (81290827) and next prime (81290843).
It is not a de Polignac number, because 81290835 - 23 = 81290827 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 81290835.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24972 + ... + 28038.
It is an arithmetic number, because the mean of its divisors is an integer number (3190720).
It is a vampire number, since it can be written as 8835 ⋅ 9201 (with its own digits).
Almost surely, 281290835 is an apocalyptic number.
81290835 is a deficient number, since it is larger than the sum of its proper divisors (71863725).
81290835 is a wasteful number, since it uses less digits than its factorization.
81290835 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3128 (or 3125 counting only the distinct ones).
The product of its (nonzero) digits is 17280, while the sum is 36.
The square root of 81290835 is about 9016.1430223794. The cubic root of 81290835 is about 433.1921002593.
The spelling of 81290835 in words is "eighty-one million, two hundred ninety thousand, eight hundred thirty-five".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.096 sec. • engine limits •