68630305 has 4 divisors (see below), whose sum is σ = 82356372. Its totient is φ = 54904240.

The previous prime is 68630297. The next prime is 68630323. The reversal of 68630305 is 50303686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50303686 = 2 ⋅25151843.

It can be written as a sum of positive squares in 2 ways, for example, as 38588944 + 30041361 = 6212^2 + 5481^2 .

It is not a de Polignac number, because 68630305 - 2³ = 68630297 is a prime.

It is a Smith number, since the sum of its digits (31) 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6863026 + ... + 6863035.

It is an arithmetic number, because the mean of its divisors is an integer number (20589093).

Almost surely, 2^68630305 is an apocalyptic number.

It is an amenable number.

68630305 is a deficient number, since it is larger than the sum of its proper divisors (13726067).

68630305 is a wasteful number, since it uses less digits than its factorization.

68630305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13726066.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 68630305 is about 8284.3409514578. The cubic root of 68630305 is about 409.4227549907.

The spelling of 68630305 in words is "sixty-eight million, six hundred thirty thousand, three hundred five".