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87931309689 = 3224593973219
BaseRepresentation
bin101000111100100011…
…1010100111001111001
322101222002021100111200
41101321013110321321
52420040403402224
6104221201044413
76232006541316
oct1217107247171
9271862240450
1087931309689
1134322a28483
1215060026709
1383a4377582
144382281d0d
15244994b5c9
hex14791d4e79

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".

Divisors: 1 3 9 2459 7377 22131 3973219 11919657 35758971 9770145521 29310436563 87931309689