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668888 = 23112691
BaseRepresentation
bin10100011010011011000
31020222112122
42203103120
5132401023
622200412
75454053
oct2432330
91228478
10668888
11417600
12283108
131a55bc
14135a9a
15d32c8
hexa34d8

668888 has 24 divisors (see below), whose sum is σ = 1380540. Its totient is φ = 303600.

The previous prime is 668879. The next prime is 668903. The reversal of 668888 is 888866.

It is a super-2 number, since 2×6688882 = 894822313088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a plaindrome in base 10.

It is a zygodrome in base 10.

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 668888.

It is an unprimeable number.

668888 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 5 ways as a sum of consecutive naturals, for example, 623 + ... + 1313.

2668888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (690270).

668888 is an abundant number, since it is smaller than the sum of its proper divisors (711652).

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

668888 is a wasteful number, since it uses less digits than its factorization.

668888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719 (or 704 counting only the distinct ones).

The product of its digits is 147456, while the sum is 44.

The square root of 668888 is about 817.8557329994. The cubic root of 668888 is about 87.4549645798.

It can be divided in two parts, 6688 and 88, that added together give a palindrome (6776).

The spelling of 668888 in words is "six hundred sixty-eight thousand, eight hundred eighty-eight".

Divisors: 1 2 4 8 11 22 44 88 121 242 484 691 968 1382 2764 5528 7601 15202 30404 60808 83611 167222 334444 668888