| Base | Representation |
|---|---|
| bin | 100111011000011… |
| … | …100110001010000 |
| 3 | 1201001021002102210 |
| 4 | 213120130301100 |
| 5 | 2323121030340 |
| 6 | 145321312120 |
| 7 | 22242014322 |
| oct | 4730346120 |
| 9 | 1631232383 |
| 10 | 660720720 |
| 11 | 309a61290 |
| 12 | 165335640 |
| 13 | a6b6890a |
| 14 | 63a71612 |
| 15 | 3d014180 |
| hex | 2761cc50 |
660720720 has 160 divisors (see below), whose sum is σ = 2256284160. Its totient is φ = 158609920.
The previous prime is 660720719. The next prime is 660720721. The reversal of 660720720 is 27027066.
It is an interprime number because it is at equal distance from previous prime (660720719) and next prime (660720721).
It is a Harshad number since it is a multiple of its sum of digits (30).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (660720721) 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 31 ways as a sum of consecutive naturals, for example, 281311 + ... + 283649.
It is an arithmetic number, because the mean of its divisors is an integer number (14101776).
Almost surely, 2660720720 is an apocalyptic number.
660720720 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 660720720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128142080).
660720720 is an abundant number, since it is smaller than the sum of its proper divisors (1595563440).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
660720720 is a wasteful number, since it uses less digits than its factorization.
660720720 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2473 (or 2467 counting only the distinct ones).
The product of its (nonzero) digits is 7056, while the sum is 30.
The square root of 660720720 is about 25704.4883240262. The cubic root of 660720720 is about 870.9755736204.
Adding to 660720720 its reverse (27027066), we get a palindrome (687747786).
The spelling of 660720720 in words is "six hundred sixty million, seven hundred twenty thousand, seven hundred twenty".
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