68135845 has 8 divisors (see below), whose sum is σ = 81807480. Its totient is φ = 54479040.

The previous prime is 68135831. The next prime is 68135869. The reversal of 68135845 is 54853186.

It can be written as a sum of positive squares in 4 ways, for example, as 8398404 + 59737441 = 2898^2 + 7729^2 .

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

It is not a de Polignac number, because 68135845 - 2²⁵ = 34581413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68135798 and 68135807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14935 + ... + 18955.

It is an arithmetic number, because the mean of its divisors is an integer number (10225935).

Almost surely, 2^68135845 is an apocalyptic number.

It is an amenable number.

68135845 is a deficient number, since it is larger than the sum of its proper divisors (13671635).

68135845 is a wasteful number, since it uses less digits than its factorization.

68135845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7415.

The product of its digits is 115200, while the sum is 40.

The square root of 68135845 is about 8254.4439546223. The cubic root of 68135845 is about 408.4371296131.

The spelling of 68135845 in words is "sixty-eight million, one hundred thirty-five thousand, eight hundred forty-five".