31728793672145 has 8 divisors (see below), whose sum is σ = 39302763774720. Its totient is φ = 24564227358960.

The previous prime is 31728793672067. The next prime is 31728793672157. The reversal of 31728793672145 is 54127639782713.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-31728793672145 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102350947175 + ... + 102350947484.

It is an arithmetic number, because the mean of its divisors is an integer number (4912845471840).

Almost surely, 2^{31728793672145} is an apocalyptic number.

It is an amenable number.

31728793672145 is a deficient number, since it is larger than the sum of its proper divisors (7573970102575).

31728793672145 is a wasteful number, since it uses less digits than its factorization.

31728793672145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204701894695.

The product of its digits is 106686720, while the sum is 65.

The spelling of 31728793672145 in words is "thirty-one trillion, seven hundred twenty-eight billion, seven hundred ninety-three million, six hundred seventy-two thousand, one hundred forty-five".