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68665 = 531443
BaseRepresentation
bin10000110000111001
310111012011
4100300321
54144130
61245521
7404122
oct206071
9114164
1068665
1147653
12338a1
132533c
141b049
151552a
hex10c39

68665 has 8 divisors (see below), whose sum is σ = 85248. Its totient is φ = 53040.

The previous prime is 68659. The next prime is 68669. The reversal of 68665 is 56686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68665 - 25 = 68633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67 + ... + 376.

It is an arithmetic number, because the mean of its divisors is an integer number (10656).

268665 is an apocalyptic number.

It is an amenable number.

68665 is a deficient number, since it is larger than the sum of its proper divisors (16583).

68665 is a wasteful number, since it uses less digits than its factorization.

68665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479.

The product of its digits is 8640, while the sum is 31.

The square root of 68665 is about 262.0400732712. The cubic root of 68665 is about 40.9491735837.

Subtracting from 68665 its product of digits (8640), we obtain a square (60025 = 2452).

The spelling of 68665 in words is "sixty-eight thousand, six hundred sixty-five".

Divisors: 1 5 31 155 443 2215 13733 68665