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71087 = 671061
BaseRepresentation
bin10001010110101111
310121111212
4101112233
54233322
61305035
7414152
oct212657
9117455
1071087
1149455
123517b
1326483
141bc99
15160e2
hex115af

71087 has 4 divisors (see below), whose sum is σ = 72216. Its totient is φ = 69960.

The previous prime is 71081. The next prime is 71089. The reversal of 71087 is 78017.

It can be divided in two parts, 710 and 87, that added together give a palindrome (797).

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71087 - 26 = 71023 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 71087.

It is not an unprimeable number, because it can be changed into a prime (71081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464 + ... + 597.

It is an arithmetic number, because the mean of its divisors is an integer number (18054).

271087 is an apocalyptic number.

71087 is a deficient number, since it is larger than the sum of its proper divisors (1129).

71087 is a wasteful number, since it uses less digits than its factorization.

71087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 71087 is about 266.6214545006. The cubic root of 71087 is about 41.4250837900.

The spelling of 71087 in words is "seventy-one thousand, eighty-seven".

Divisors: 1 67 1061 71087