Base | Representation |
---|---|
bin | 101000111100100011… |
… | …1010100111001111001 |
3 | 22101222002021100111200 |
4 | 1101321013110321321 |
5 | 2420040403402224 |
6 | 104221201044413 |
7 | 6232006541316 |
oct | 1217107247171 |
9 | 271862240450 |
10 | 87931309689 |
11 | 34322a28483 |
12 | 15060026709 |
13 | 83a4377582 |
14 | 4382281d0d |
15 | 244994b5c9 |
hex | 14791d4e79 |
87931309689 has 12 divisors (see below), whose sum is σ = 127063575600. Its totient is φ = 58597019064.
The previous prime is 87931309681. The next prime is 87931309699. The reversal of 87931309689 is 98690313978.
It is not a de Polignac number, because 87931309689 - 23 = 87931309681 is a prime.
It is not an unprimeable number, because it can be changed into a prime (87931309681) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1964479 + ... + 2008740.
It is an arithmetic number, because the mean of its divisors is an integer number (10588631300).
Almost surely, 287931309689 is an apocalyptic number.
It is an amenable number.
87931309689 is a deficient number, since it is larger than the sum of its proper divisors (39132265911).
87931309689 is a wasteful number, since it uses less digits than its factorization.
87931309689 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3975684 (or 3975681 counting only the distinct ones).
The product of its (nonzero) digits is 17635968, while the sum is 63.
The spelling of 87931309689 in words is "eighty-seven billion, nine hundred thirty-one million, three hundred nine thousand, six hundred eighty-nine".
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