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561665360 = 24535319889
BaseRepresentation
bin100001011110100…
…101010101010000
31110010212120000202
4201132211111100
52122241242420
6131422234332
716630035224
oct4136452520
91403776022
10561665360
11269055553
121381259a8
138c496089
1454848784
1534499575
hex217a5550

561665360 has 40 divisors (see below), whose sum is σ = 1309637160. Its totient is φ = 224018432.

The previous prime is 561665333. The next prime is 561665371. The reversal of 561665360 is 63566165.

It can be written as a sum of positive squares in 4 ways, for example, as 151683856 + 409981504 = 12316^2 + 20248^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18296 + ... + 38184.

It is an arithmetic number, because the mean of its divisors is an integer number (32740929).

Almost surely, 2561665360 is an apocalyptic number.

It is an amenable number.

561665360 is an abundant number, since it is smaller than the sum of its proper divisors (747971800).

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

561665360 is a wasteful number, since it uses less digits than its factorization.

561665360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20255 (or 20249 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 561665360 is about 23699.4801630753. The cubic root of 561665360 is about 825.0733255916.

The spelling of 561665360 in words is "five hundred sixty-one million, six hundred sixty-five thousand, three hundred sixty".

Divisors: 1 2 4 5 8 10 16 20 40 80 353 706 1412 1765 2824 3530 5648 7060 14120 19889 28240 39778 79556 99445 159112 198890 318224 397780 795560 1591120 7020817 14041634 28083268 35104085 56166536 70208170 112333072 140416340 280832680 561665360