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68756481 = 3231246439
BaseRepresentation
bin1000001100100…
…10010000000001
311210101012011100
410012102100001
5120100201411
610453405013
71463264133
oct406222001
9153335140
1068756481
11358a1842
121b039769
1311324811
1491bb053
156082456
hex4192401

68756481 has 12 divisors (see below), whose sum is σ = 102519040. Its totient is φ = 44358840.

The previous prime is 68756473. The next prime is 68756521. The reversal of 68756481 is 18465786.

It is a happy number.

68756481 is a `hidden beast` number, since 6 + 8 + 7 + 564 + 81 = 666.

It is not a de Polignac number, because 68756481 - 23 = 68756473 is a prime.

It is a super-2 number, since 2×687564812 = 9454907359006722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68756411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122941 + ... + 123498.

Almost surely, 268756481 is an apocalyptic number.

It is an amenable number.

68756481 is a deficient number, since it is larger than the sum of its proper divisors (33762559).

68756481 is a wasteful number, since it uses less digits than its factorization.

68756481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246476 (or 246473 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 68756481 is about 8291.9527856832. The cubic root of 68756481 is about 409.6735076744.

The spelling of 68756481 in words is "sixty-eight million, seven hundred fifty-six thousand, four hundred eighty-one".