| Base | Representation |
|---|---|
| bin | 10001001010000… |
| … | …110011111110000 |
| 3 | 202001122211200011 |
| 4 | 101022012133300 |
| 5 | 1042143020340 |
| 6 | 44321504304 |
| 7 | 10063530040 |
| oct | 2112063760 |
| 9 | 661584604 |
| 10 | 287860720 |
| 11 | 138543024 |
| 12 | 804a2094 |
| 13 | 4783a5b4 |
| 14 | 2a333720 |
| 15 | 1a4120ea |
| hex | 112867f0 |
287860720 has 80 divisors (see below), whose sum is σ = 771825600. Its totient is φ = 97800192.
The previous prime is 287860687. The next prime is 287860723. The reversal of 287860720 is 27068782.
287860720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a tau number, because it is divible by the number of its divisors (80).
It is a Harshad number since it is a multiple of its sum of digits (40).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (287860723) 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, 61006 + ... + 65554.
It is an arithmetic number, because the mean of its divisors is an integer number (9647820).
Almost surely, 2287860720 is an apocalyptic number.
287860720 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 287860720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (385912800).
287860720 is an abundant number, since it is smaller than the sum of its proper divisors (483964880).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
287860720 is a wasteful number, since it uses less digits than its factorization.
287860720 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4682 (or 4676 counting only the distinct ones).
The product of its (nonzero) digits is 75264, while the sum is 40.
The square root of 287860720 is about 16966.4586758699. The cubic root of 287860720 is about 660.2789760327.
The spelling of 287860720 in words is "two hundred eighty-seven million, eight hundred sixty thousand, seven hundred twenty".
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