| Base | Representation |
|---|---|
| bin | 11101000100010010… |
| … | …010011100001100000 |
| 3 | 2222120002220121220100 |
| 4 | 131010102103201200 |
| 5 | 1002404331422240 |
| 6 | 22200551342400 |
| 7 | 2153265124032 |
| oct | 350422234140 |
| 9 | 88502817810 |
| 10 | 31210420320 |
| 11 | 12266517802 |
| 12 | 6070381a00 |
| 13 | 2c35097541 |
| 14 | 17210cbc52 |
| 15 | c2a021e30 |
| hex | 744493860 |
31210420320 has 144 divisors (see below), whose sum is σ = 107702693280. Its totient is φ = 8229230592.
The previous prime is 31210420313. The next prime is 31210420333. The reversal of 31210420320 is 2302401213.
31210420320 is a `hidden beast` number, since 3 + 1 + 210 + 420 + 32 + 0 = 666.
It is a tau number, because it is divible by the number of its divisors (144).
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 31210420293 and 31210420302.
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 23 ways as a sum of consecutive naturals, for example, 6397 + ... + 249923.
It is an arithmetic number, because the mean of its divisors is an integer number (747935370).
Almost surely, 231210420320 is an apocalyptic number.
31210420320 is a gapful number since it is divisible by the number (30) 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 31210420320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53851346640).
31210420320 is an abundant number, since it is smaller than the sum of its proper divisors (76492272960).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31210420320 is a wasteful number, since it uses less digits than its factorization.
31210420320 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 243637 (or 243626 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 18.
Adding to 31210420320 its reverse (2302401213), we get a palindrome (33512821533).
The spelling of 31210420320 in words is "thirty-one billion, two hundred ten million, four hundred twenty thousand, three hundred twenty".
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