68260645 has 4 divisors (see below), whose sum is σ = 81912780. Its totient is φ = 54608512.

The previous prime is 68260639. The next prime is 68260649. The reversal of 68260645 is 54606286.

It is a Cunningham number, because it is equal to 8262²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24581764 + 43678881 = 4958^2 + 6609^2 .

It is a cyclic number.

It is not a de Polignac number, because 68260645 - 2³ = 68260637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68260649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6826060 + ... + 6826069.

It is an arithmetic number, because the mean of its divisors is an integer number (20478195).

Almost surely, 2^68260645 is an apocalyptic number.

It is an amenable number.

68260645 is a deficient number, since it is larger than the sum of its proper divisors (13652135).

68260645 is a wasteful number, since it uses less digits than its factorization.

68260645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13652134.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 68260645 is about 8262.0000605180. Note that the first 4 decimals coincide. The cubic root of 68260645 is about 408.6863467671.

The spelling of 68260645 in words is "sixty-eight million, two hundred sixty thousand, six hundred forty-five".