68191945 has 8 divisors (see below), whose sum is σ = 82321344. Its totient is φ = 54226224.

The previous prime is 68191901. The next prime is 68191951. The reversal of 68191945 is 54919186.

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

It is a cyclic number.

It is not a de Polignac number, because 68191945 - 2¹⁵ = 68159177 is a prime.

It is a Duffinian 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, 39999 + ... + 41668.

It is an arithmetic number, because the mean of its divisors is an integer number (10290168).

Almost surely, 2^68191945 is an apocalyptic number.

It is an amenable number.

68191945 is a deficient number, since it is larger than the sum of its proper divisors (14129399).

68191945 is a wasteful number, since it uses less digits than its factorization.

68191945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81839.

The product of its digits is 77760, while the sum is 43.

The square root of 68191945 is about 8257.8414249730. The cubic root of 68191945 is about 408.5491951357.

The spelling of 68191945 in words is "sixty-eight million, one hundred ninety-one thousand, nine hundred forty-five".