Base | Representation |
---|---|
bin | 111011011110101… |
… | …001101001100100 |
3 | 2120112201002122100 |
4 | 323132221221210 |
5 | 4020430000120 |
6 | 243004132100 |
7 | 33504634134 |
oct | 7336515144 |
9 | 2515632570 |
10 | 997890660 |
11 | 472313028 |
12 | 23a237030 |
13 | 12b97c060 |
14 | 9675cac4 |
15 | 5c916490 |
hex | 3b7a9a64 |
997890660 has 144 divisors (see below), whose sum is σ = 3274689600. Its totient is φ = 244512000.
The previous prime is 997890653. The next prime is 997890671. The reversal of 997890660 is 66098799.
It is a junction number, because it is equal to n+sod(n) for n = 997890597 and 997890606.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 586491 + ... + 588189.
It is an arithmetic number, because the mean of its divisors is an integer number (22740900).
Almost surely, 2997890660 is an apocalyptic number.
997890660 is a gapful number since it is divisible by the number (90) 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 997890660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1637344800).
997890660 is an abundant number, since it is smaller than the sum of its proper divisors (2276798940).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
997890660 is a wasteful number, since it uses less digits than its factorization.
With its predecessor (997890659) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1978).
997890660 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1978 (or 1973 counting only the distinct ones).
The product of its (nonzero) digits is 1469664, while the sum is 54.
The square root of 997890660 is about 31589.4074018491. The cubic root of 997890660 is about 999.2963917182.
The spelling of 997890660 in words is "nine hundred ninety-seven million, eight hundred ninety thousand, six hundred sixty".
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