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68720525312 = 22065537
BaseRepresentation
bin100000000000000010…
…0000000000000000000
320120101020210101120012
41000000010000000000
52111214423302222
651323023204052
74651646553515
oct1000004000000
9216336711505
1068720525312
1127164a4387a
121139a446628
136632347c3a
14347cb1930c
151bc31271e2
hex1000100000

68720525312 has 42 divisors (see below), whose sum is σ = 137443082238. Its totient is φ = 34359738368.

The previous prime is 68720525287. The next prime is 68720525347. The reversal of 68720525312 is 21352502786.

It can be written as a sum of positive squares in only one way, i.e., 68719476736 + 1048576 = 262144^2 + 1024^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 68720525312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (2) of ones.

In principle, a polygon with 68720525312 sides can be constructed with ruler and compass.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1015808 + ... + 1081344.

It is an arithmetic number, because the mean of its divisors is an integer number (3272454339).

Almost surely, 268720525312 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 68720525312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68721541119).

68720525312 is an abundant number, since it is smaller than the sum of its proper divisors (68722556926).

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

68720525312 is an frugal number, since it uses more digits than its factorization.

68720525312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65577 (or 65539 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 68720525312 in words is "sixty-eight billion, seven hundred twenty million, five hundred twenty-five thousand, three hundred twelve".

Divisors: 1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768 65536 65537 131072 131074 262144 262148 524288 524296 1048576 1048592 2097184 4194368 8388736 16777472 33554944 67109888 134219776 268439552 536879104 1073758208 2147516416 4295032832 8590065664 17180131328 34360262656 68720525312