68172473 has 4 divisors (see below), whose sum is σ = 68875380. Its totient is φ = 67469568.

The previous prime is 68172427. The next prime is 68172491. The reversal of 68172473 is 37427186.

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 37613689 + 30558784 = 6133^2 + 5528^2 .

It is a cyclic number.

It is not a de Polignac number, because 68172473 - 2⁶ = 68172409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68172073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351308 + ... + 351501.

It is an arithmetic number, because the mean of its divisors is an integer number (17218845).

Almost surely, 2^68172473 is an apocalyptic number.

It is an amenable number.

68172473 is a deficient number, since it is larger than the sum of its proper divisors (702907).

68172473 is an equidigital number, since it uses as much as digits as its factorization.

68172473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702906.

The product of its digits is 56448, while the sum is 38.

The square root of 68172473 is about 8256.6623401953. The cubic root of 68172473 is about 408.5103047788.

The spelling of 68172473 in words is "sixty-eight million, one hundred seventy-two thousand, four hundred seventy-three".