68906105 has 4 divisors (see below), whose sum is σ = 82687332. Its totient is φ = 55124880.

The previous prime is 68906063. The next prime is 68906107. The reversal of 68906105 is 50160986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50160986 = 2 ⋅25080493.

It can be written as a sum of positive squares in 2 ways, for example, as 11812969 + 57093136 = 3437^2 + 7556^2 .

It is not a de Polignac number, because 68906105 - 2⁸ = 68905849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68906107) 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, 6890606 + ... + 6890615.

It is an arithmetic number, because the mean of its divisors is an integer number (20671833).

Almost surely, 2^68906105 is an apocalyptic number.

It is an amenable number.

68906105 is a deficient number, since it is larger than the sum of its proper divisors (13781227).

68906105 is a wasteful number, since it uses less digits than its factorization.

68906105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13781226.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 68906105 is about 8300.9701240277. The cubic root of 68906105 is about 409.9704618815.

The spelling of 68906105 in words is "sixty-eight million, nine hundred six thousand, one hundred five".