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664 = 2383
BaseRepresentation
bin1010011000
3220121
422120
510124
63024
71636
oct1230
9817
10664
11554
12474
133c1
14356
152e4
hex298

664 has 8 divisors (see below), whose sum is σ = 1260. Its totient is φ = 328.

The previous prime is 661. The next prime is 673. The reversal of 664 is 466.

Adding to 664 its product of digits (144), we get a palindrome (808).

664 is nontrivially palindromic in base 12.

It is a tau number, because it is divible by the number of its divisors (8).

664 is an undulating number in base 12.

It is a plaindrome in base 14.

It is a nialpdrome in base 10 and base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34 + ... + 49.

2664 is an apocalyptic number.

It is an amenable number.

664 is a deficient number, since it is larger than the sum of its proper divisors (596).

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

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

The sum of its prime factors is 89 (or 85 counting only the distinct ones).

The product of its digits is 144, while the sum is 16.

The square root of 664 is about 25.7681974535. The cubic root of 664 is about 8.7241413429.

The spelling of 664 in words is "six hundred sixty-four", and thus it is an aban number.

Divisors: 1 2 4 8 83 166 332 664