28571572973 has 4 divisors (see below), whose sum is σ = 28736726748. Its totient is φ = 28406419200.

The previous prime is 28571572963. The next prime is 28571572987. The reversal of 28571572973 is 37927517582.

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 26711979844 + 1859593129 = 163438^2 + 43123^2 .

It is a cyclic number.

It is not a de Polignac number, because 28571572973 - 2¹⁰ = 28571571949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28571572963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82576628 + ... + 82576973.

It is an arithmetic number, because the mean of its divisors is an integer number (7184181687).

Almost surely, 2^28571572973 is an apocalyptic number.

It is an amenable number.

28571572973 is a deficient number, since it is larger than the sum of its proper divisors (165153775).

28571572973 is a wasteful number, since it uses less digits than its factorization.

28571572973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165153774.

The product of its digits is 7408800, while the sum is 56.

The spelling of 28571572973 in words is "twenty-eight billion, five hundred seventy-one million, five hundred seventy-two thousand, nine hundred seventy-three".