68172945 has 16 divisors (see below), whose sum is σ = 109226880. Its totient is φ = 36308864.

The previous prime is 68172917. The next prime is 68172953. The reversal of 68172945 is 54927186.

It is a cyclic number.

It is not a de Polignac number, because 68172945 - 2¹⁶ = 68107409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68172897 and 68172906.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9877 + ... + 15293.

It is an arithmetic number, because the mean of its divisors is an integer number (6826680).

Almost surely, 2^68172945 is an apocalyptic number.

It is an amenable number.

68172945 is a deficient number, since it is larger than the sum of its proper divisors (41053935).

68172945 is a wasteful number, since it uses less digits than its factorization.

68172945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6264.

The product of its digits is 120960, while the sum is 42.

The square root of 68172945 is about 8256.6909231241. The cubic root of 68172945 is about 408.5112475661.

The spelling of 68172945 in words is "sixty-eight million, one hundred seventy-two thousand, nine hundred forty-five".