| Base | Representation |
|---|---|
| bin | 1000111001110… |
| … | …00101111000001 |
| 3 | 12012112012110101 |
| 4 | 10130320233001 |
| 5 | 123104300111 |
| 6 | 11224402401 |
| 7 | 1564531453 |
| oct | 434705701 |
| 9 | 165465411 |
| 10 | 74681281 |
| 11 | 39179174 |
| 12 | 21016401 |
| 13 | 1261a50c |
| 14 | 9cc02d3 |
| 15 | 6852bc1 |
| hex | 4738bc1 |
74681281 has 4 divisors (see below), whose sum is σ = 76699732. Its totient is φ = 72662832.
The previous prime is 74681273. The next prime is 74681287. The reversal of 74681281 is 18218647.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18218647 = 2609 ⋅6983.
It can be written as a sum of positive squares in 2 ways, for example, as 66178225 + 8503056 = 8135^2 + 2916^2 .
It is a cyclic number.
It is not a de Polignac number, because 74681281 - 23 = 74681273 is a prime.
It is a super-2 number, since 2×746812812 = 11154587463601922, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 2018413 = 74681281 / (7 + 4 + 6 + 8 + 1 + 2 + 8 + 1).
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 74681281.
It is not an unprimeable number, because it can be changed into a prime (74681287) by changing a digit.
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 3 ways as a sum of consecutive naturals, for example, 1009170 + ... + 1009243.
It is an arithmetic number, because the mean of its divisors is an integer number (19174933).
Almost surely, 274681281 is an apocalyptic number.
It is an amenable number.
74681281 is a deficient number, since it is larger than the sum of its proper divisors (2018451).
74681281 is a wasteful number, since it uses less digits than its factorization.
74681281 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2018450.
The product of its digits is 21504, while the sum is 37.
The square root of 74681281 is about 8641.8331967239. The cubic root of 74681281 is about 421.1181110827.
The spelling of 74681281 in words is "seventy-four million, six hundred eighty-one thousand, two hundred eighty-one".
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