68732905 has 4 divisors (see below), whose sum is σ = 82479492. Its totient is φ = 54986320.

The previous prime is 68732879. The next prime is 68732969. The reversal of 68732905 is 50923786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50923786 = 2 ⋅25461893.

It can be written as a sum of positive squares in 2 ways, for example, as 37417689 + 31315216 = 6117^2 + 5596^2 .

It is not a de Polignac number, because 68732905 - 2⁷ = 68732777 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 6873286 + ... + 6873295.

It is an arithmetic number, because the mean of its divisors is an integer number (20619873).

Almost surely, 2^68732905 is an apocalyptic number.

It is an amenable number.

68732905 is a deficient number, since it is larger than the sum of its proper divisors (13746587).

68732905 is a wasteful number, since it uses less digits than its factorization.

68732905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13746586.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 68732905 is about 8290.5310445110. The cubic root of 68732905 is about 409.6266778259.

The spelling of 68732905 in words is "sixty-eight million, seven hundred thirty-two thousand, nine hundred five".