| Base | Representation |
|---|---|
| bin | 11010010110101… |
| … | …01010011010000 |
| 3 | 120101222202101122 |
| 4 | 31023111103100 |
| 5 | 423043342030 |
| 6 | 33534221412 |
| 7 | 5323050323 |
| oct | 1513252320 |
| 9 | 511882348 |
| 10 | 221074640 |
| 11 | 103877716 |
| 12 | 62054868 |
| 13 | 36a558c7 |
| 14 | 2150a7ba |
| 15 | 1461d8e5 |
| hex | d2d54d0 |
221074640 has 80 divisors (see below), whose sum is σ = 536632320. Its totient is φ = 84602880.
The previous prime is 221074631. The next prime is 221074649. The reversal of 221074640 is 46470122.
It is an interprime number because it is at equal distance from previous prime (221074631) and next prime (221074649).
It is a tau number, because it is divible by the number of its divisors (80).
It is a super-2 number, since 2×2210746402 = 97747992902259200, which contains 22 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (221074649) 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 15 ways as a sum of consecutive naturals, for example, 240101 + ... + 241019.
It is an arithmetic number, because the mean of its divisors is an integer number (6707904).
Almost surely, 2221074640 is an apocalyptic number.
221074640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 221074640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268316160).
221074640 is an abundant number, since it is smaller than the sum of its proper divisors (315557680).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
221074640 is a wasteful number, since it uses less digits than its factorization.
221074640 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1060 (or 1054 counting only the distinct ones).
The product of its (nonzero) digits is 2688, while the sum is 26.
The square root of 221074640 is about 14868.5789502561. The cubic root of 221074640 is about 604.6624166806.
The spelling of 221074640 in words is "two hundred twenty-one million, seventy-four thousand, six hundred forty".
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