68045681 has 6 divisors (see below), whose sum is σ = 74794146. Its totient is φ = 61859600.

The previous prime is 68045671. The next prime is 68045699. The reversal of 68045681 is 18654086.

It can be written as a sum of positive squares in only one way, i.e., 59290000 + 8755681 = 7700^2 + 2959^2 .

It is not a de Polignac number, because 68045681 - 2⁶ = 68045617 is a prime.

It is a super-2 number, since 2×68045681² = 9260429405507522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68045671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 281060 + ... + 281301.

It is an arithmetic number, because the mean of its divisors is an integer number (12465691).

Almost surely, 2^68045681 is an apocalyptic number.

It is an amenable number.

68045681 is a deficient number, since it is larger than the sum of its proper divisors (6748465).

68045681 is a wasteful number, since it uses less digits than its factorization.

68045681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562383 (or 562372 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 68045681 is about 8248.9806036867. The cubic root of 68045681 is about 408.2568887948.

The spelling of 68045681 in words is "sixty-eight million, forty-five thousand, six hundred eighty-one".