68306505 has 16 divisors (see below), whose sum is σ = 109405824. Its totient is φ = 36391680.

The previous prime is 68306471. The next prime is 68306543. The reversal of 68306505 is 50560386.

It is not a de Polignac number, because 68306505 - 2⁷ = 68306377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17700 + ... + 21210.

It is an arithmetic number, because the mean of its divisors is an integer number (6837864).

Almost surely, 2^68306505 is an apocalyptic number.

It is an amenable number.

68306505 is a deficient number, since it is larger than the sum of its proper divisors (41099319).

68306505 is a wasteful number, since it uses less digits than its factorization.

68306505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4816.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 68306505 is about 8264.7749515640. The cubic root of 68306505 is about 408.7778497610. Note that the first 3 decimals are identical.

The spelling of 68306505 in words is "sixty-eight million, three hundred six thousand, five hundred five".