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66858 = 23111013
BaseRepresentation
bin10000010100101010
310101201020
4100110222
54114413
61233310
7365631
oct202452
9111636
1066858
1146260
1232836
132457c
141a518
1514c23
hex1052a

66858 has 16 divisors (see below), whose sum is σ = 146016. Its totient is φ = 20240.

The previous prime is 66853. The next prime is 66863. The reversal of 66858 is 85866.

It is an interprime number because it is at equal distance from previous prime (66853) and next prime (66863).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (66851) by changing a digit.

66858 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441 + ... + 572.

It is an arithmetic number, because the mean of its divisors is an integer number (9126).

266858 is an apocalyptic number.

66858 is an abundant number, since it is smaller than the sum of its proper divisors (79158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73008).

66858 is a wasteful number, since it uses less digits than its factorization.

66858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029.

The product of its digits is 11520, while the sum is 33.

The square root of 66858 is about 258.5691396899. The cubic root of 66858 is about 40.5867671856.

The spelling of 66858 in words is "sixty-six thousand, eight hundred fifty-eight".

Divisors: 1 2 3 6 11 22 33 66 1013 2026 3039 6078 11143 22286 33429 66858