68013905 has 8 divisors (see below), whose sum is σ = 82425384. Its totient is φ = 53872000.

The previous prime is 68013899. The next prime is 68013919. The reversal of 68013905 is 50931086.

It can be written as a sum of positive squares in 4 ways, for example, as 3356224 + 64657681 = 1832^2 + 8041^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68013905 - 2¹⁰ = 68012881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 66836 + ... + 67845.

It is an arithmetic number, because the mean of its divisors is an integer number (10303173).

Almost surely, 2^68013905 is an apocalyptic number.

It is an amenable number.

68013905 is a deficient number, since it is larger than the sum of its proper divisors (14411479).

68013905 is a wasteful number, since it uses less digits than its factorization.

68013905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134787.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 68013905 is about 8247.0543226051. The cubic root of 68013905 is about 408.1933295771.

The spelling of 68013905 in words is "sixty-eight million, thirteen thousand, nine hundred five".