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66928 = 244789
BaseRepresentation
bin10000010101110000
310101210211
4100111300
54120203
61233504
7366061
oct202560
9111724
1066928
1146314
1232894
1324604
141a568
1514c6d
hex10570

66928 has 20 divisors (see below), whose sum is σ = 133920. Its totient is φ = 32384.

The previous prime is 66923. The next prime is 66931. The reversal of 66928 is 82966.

Together with 66992 it forms an amicable pair .

66928 is a Rhonda number in base 12.

Its product of digits (5184) is a multiple of the sum of its prime factors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 66928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66923) 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, 708 + ... + 796.

It is an arithmetic number, because the mean of its divisors is an integer number (6696).

266928 is an apocalyptic number.

It is an amenable number.

66928 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66928 is a wasteful number, since it uses less digits than its factorization.

66928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 138 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 66928 is about 258.7044645923. The cubic root of 66928 is about 40.6009269608.

The spelling of 66928 in words is "sixty-six thousand, nine hundred twenty-eight".

Divisors: 1 2 4 8 16 47 89 94 178 188 356 376 712 752 1424 4183 8366 16732 33464 66928