| Base | Representation |
|---|---|
| bin | 1000001010000… |
| … | …01000100000100 |
| 3 | 11202202022000000 |
| 4 | 10011001010010 |
| 5 | 120004031230 |
| 6 | 10442321300 |
| 7 | 1460410464 |
| oct | 405010404 |
| 9 | 152668000 |
| 10 | 68423940 |
| 11 | 35694a12 |
| 12 | 1aab9230 |
| 13 | 11239350 |
| 14 | 9131ba4 |
| 15 | 6018b60 |
| hex | 4141104 |
68423940 has 252 divisors, whose sum is σ = 244862604. Its totient is φ = 15956352.
The previous prime is 68423939. The next prime is 68423941. The reversal of 68423940 is 4932486.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (68423939) and next prime (68423941).
It can be written as a sum of positive squares in 2 ways, for example, as 16842816 + 51581124 = 4104^2 + 7182^2 .
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a junction number, because it is equal to n+sod(n) for n = 68423895 and 68423904.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (68423941) by changing a digit.
It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 3601251 + ... + 3601269.
It is an arithmetic number, because the mean of its divisors is an integer number (971677).
Almost surely, 268423940 is an apocalyptic number.
68423940 is a gapful number since it is divisible by the number (60) 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 68423940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122431302).
68423940 is an abundant number, since it is smaller than the sum of its proper divisors (176438664).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
68423940 is a wasteful number, since it uses less digits than its factorization.
68423940 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 78 (or 42 counting only the distinct ones).
The product of its (nonzero) digits is 41472, while the sum is 36.
The square root of 68423940 is about 8271.8764497543. The cubic root of 68423940 is about 409.0119774989.
The spelling of 68423940 in words is "sixty-eight million, four hundred twenty-three thousand, nine hundred forty".
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