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668564 = 221322343
BaseRepresentation
bin10100011001110010100
31020222002122
42203032110
5132343224
622155112
75453111
oct2431624
91228078
10668564
11417336
12282a98
131a5400
14135908
15d315e
hexa3394

668564 has 36 divisors (see below), whose sum is σ = 1352736. Its totient is φ = 288288.

The previous prime is 668543. The next prime is 668567. The reversal of 668564 is 465866.

Its product of digits (34560) is a multiple of the sum of its prime factors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668567) 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, 15527 + ... + 15569.

It is an arithmetic number, because the mean of its divisors is an integer number (37576).

668564 is a Friedman number, since it can be written as 86*(6^5-6+4), using all its digits and the basic arithmetic operations.

2668564 is an apocalyptic number.

It is an amenable number.

668564 is an abundant number, since it is smaller than the sum of its proper divisors (684172).

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

668564 is a wasteful number, since it uses less digits than its factorization.

668564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 81 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 668564 is about 817.6576300629. The cubic root of 668564 is about 87.4408416450.

The spelling of 668564 in words is "six hundred sixty-eight thousand, five hundred sixty-four".

Divisors: 1 2 4 13 23 26 43 46 52 86 92 169 172 299 338 559 598 676 989 1118 1196 1978 2236 3887 3956 7267 7774 12857 14534 15548 25714 29068 51428 167141 334282 668564