871815228578 has 54 divisors (see below), whose sum is σ = 1531343389329. Its totient is φ = 371167147008.

The previous prime is 871815228577. The next prime is 871815228653. The reversal of 871815228578 is 875822518178.

It can be written as a sum of positive squares in 2 ways, for example, as 543615713809 + 328199514769 = 737303^2 + 572887^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=660233.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 871815228578.

It is not an unprimeable number, because it can be changed into a prime (871815228577) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2375518151 + ... + 2375518517.

Almost surely, 2^871815228578 is an apocalyptic number.

871815228578 is a deficient number, since it is larger than the sum of its proper divisors (659528160751).

871815228578 is an frugal number, since it uses more digits than its factorization.

871815228578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264 (or 633 counting only the distinct ones).

The product of its digits is 20070400, while the sum is 62.

The spelling of 871815228578 in words is "eight hundred seventy-one billion, eight hundred fifteen million, two hundred twenty-eight thousand, five hundred seventy-eight".