31728573143 has 8 divisors (see below), whose sum is σ = 32061820560. Its totient is φ = 31396092480.

The previous prime is 31728573113. The next prime is 31728573229. The reversal of 31728573143 is 34137582713.

It is a happy number.

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 31728573143 - 2¹⁰ = 31728572119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31728573094 and 31728573103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31728573103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108305 + ... + 274202.

It is an arithmetic number, because the mean of its divisors is an integer number (4007727570).

Almost surely, 2^31728573143 is an apocalyptic number.

31728573143 is a deficient number, since it is larger than the sum of its proper divisors (333247417).

31728573143 is a wasteful number, since it uses less digits than its factorization.

31728573143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383377.

The product of its digits is 423360, while the sum is 44.

The spelling of 31728573143 in words is "thirty-one billion, seven hundred twenty-eight million, five hundred seventy-three thousand, one hundred forty-three".