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68064445 = 513612889
BaseRepresentation
bin1000000111010…
…01010010111101
311202002000212101
410003221102331
5114411030240
610430505101
71454352421
oct403512275
9152060771
1068064445
1135469909
121a965191
1311141827
14907ab81
155e9739a
hex40e94bd

68064445 has 4 divisors (see below), whose sum is σ = 81677340. Its totient is φ = 54451552.

The previous prime is 68064443. The next prime is 68064449. The reversal of 68064445 is 54446086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54446086 = 227223043.

It can be written as a sum of positive squares in 2 ways, for example, as 51065316 + 16999129 = 7146^2 + 4123^2 .

It is a cyclic number.

It is not a de Polignac number, because 68064445 - 21 = 68064443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68064443) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6806440 + ... + 6806449.

It is an arithmetic number, because the mean of its divisors is an integer number (20419335).

Almost surely, 268064445 is an apocalyptic number.

It is an amenable number.

68064445 is a deficient number, since it is larger than the sum of its proper divisors (13612895).

68064445 is a wasteful number, since it uses less digits than its factorization.

68064445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13612894.

The product of its (nonzero) digits is 92160, while the sum is 37.

The square root of 68064445 is about 8250.1178779457. The cubic root of 68064445 is about 408.2944117652.

The spelling of 68064445 in words is "sixty-eight million, sixty-four thousand, four hundred forty-five".

Divisors: 1 5 13612889 68064445