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68670208 = 281731509
BaseRepresentation
bin1000001011111…
…01001100000000
311210012210211001
410011331030000
5120034421313
610451501344
71462454455
oct405751400
9153183731
1068670208
1135842a42
121abb7854
13112c4479
14919782c
156066add
hex417d300

68670208 has 72 divisors (see below), whose sum is σ = 150111360. Its totient is φ = 31211520.

The previous prime is 68670193. The next prime is 68670209. The reversal of 68670208 is 80207686.

It is not an unprimeable number, because it can be changed into a prime (68670209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134658 + ... + 135166.

It is an arithmetic number, because the mean of its divisors is an integer number (2084880).

Almost surely, 268670208 is an apocalyptic number.

68670208 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68670208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75055680).

68670208 is an abundant number, since it is smaller than the sum of its proper divisors (81441152).

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

68670208 is a wasteful number, since it uses less digits than its factorization.

68670208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 559 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 68670208 is about 8286.7489403264. The cubic root of 68670208 is about 409.5020884133.

The spelling of 68670208 in words is "sixty-eight million, six hundred seventy thousand, two hundred eight".

Divisors: 1 2 4 8 16 17 31 32 34 62 64 68 124 128 136 248 256 272 496 509 527 544 992 1018 1054 1088 1984 2036 2108 2176 3968 4072 4216 4352 7936 8144 8432 8653 15779 16288 16864 17306 31558 32576 33728 34612 63116 65152 67456 69224 126232 130304 134912 138448 252464 268243 276896 504928 536486 553792 1009856 1072972 1107584 2019712 2145944 2215168 4039424 4291888 8583776 17167552 34335104 68670208