71579428573 has 4 divisors (see below), whose sum is σ = 71610112188. Its totient is φ = 71548744960.

The previous prime is 71579428537. The next prime is 71579428577. The reversal of 71579428573 is 37582497517.

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 51111262084 + 20468166489 = 226078^2 + 143067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71579428573 is a prime.

It is a super-2 number, since 2×71579428573² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71579428577) 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, 15338308 + ... + 15342973.

It is an arithmetic number, because the mean of its divisors is an integer number (17902528047).

Almost surely, 2^71579428573 is an apocalyptic number.

It is an amenable number.

71579428573 is a deficient number, since it is larger than the sum of its proper divisors (30683615).

71579428573 is a wasteful number, since it uses less digits than its factorization.

71579428573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30683614.

The product of its digits is 14817600, while the sum is 58.

The spelling of 71579428573 in words is "seventy-one billion, five hundred seventy-nine million, four hundred twenty-eight thousand, five hundred seventy-three".