68170945 has 4 divisors (see below), whose sum is σ = 81805140. Its totient is φ = 54536752.

The previous prime is 68170943. The next prime is 68170951. The reversal of 68170945 is 54907186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23775376 + 44395569 = 4876^2 + 6663^2 .

It is a cyclic number.

It is not a de Polignac number, because 68170945 - 2¹ = 68170943 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 junction number, because it is equal to n+sod(n) for n = 68170898 and 68170907.

It is not an unprimeable number, because it can be changed into a prime (68170943) 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, 6817090 + ... + 6817099.

It is an arithmetic number, because the mean of its divisors is an integer number (20451285).

Almost surely, 2^68170945 is an apocalyptic number.

It is an amenable number.

68170945 is a deficient number, since it is larger than the sum of its proper divisors (13634195).

68170945 is a wasteful number, since it uses less digits than its factorization.

68170945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13634194.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 68170945 is about 8256.5698083405. The cubic root of 68170945 is about 408.5072526749.

The spelling of 68170945 in words is "sixty-eight million, one hundred seventy thousand, nine hundred forty-five".