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664668 = 223237499
BaseRepresentation
bin10100010010001011100
31020202202100
42202101130
5132232133
622125100
75435544
oct2422134
91222670
10664668
11414414
12280790
131a36c4
14134324
15d1e13
hexa245c

664668 has 36 divisors (see below), whose sum is σ = 1729000. Its totient is φ = 215136.

The previous prime is 664667. The next prime is 664669. The reversal of 664668 is 866466.

664668 is a `hidden beast` number, since 6 + 646 + 6 + 8 = 666.

664668 is nontrivially palindromic in base 11.

It is an interprime number because it is at equal distance from previous prime (664667) and next prime (664669).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1083 + ... + 1581.

2664668 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 664668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864500).

664668 is an abundant number, since it is smaller than the sum of its proper divisors (1064332).

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

664668 is a wasteful number, since it uses less digits than its factorization.

664668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 541 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 664668 is about 815.2717338409. The cubic root of 664668 is about 87.2706592786.

The spelling of 664668 in words is "six hundred sixty-four thousand, six hundred sixty-eight".

Divisors: 1 2 3 4 6 9 12 18 36 37 74 111 148 222 333 444 499 666 998 1332 1497 1996 2994 4491 5988 8982 17964 18463 36926 55389 73852 110778 166167 221556 332334 664668