820879488575 has 12 divisors (see below), whose sum is σ = 1017919776048. Its totient is φ = 656684745600.

The previous prime is 820879488553. The next prime is 820879488587. The reversal of 820879488575 is 575884978028.

It is a Cunningham number, because it is equal to 906024²-1.

It is not a de Polignac number, because 820879488575 - 2³⁰ = 819805746751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820879488499 and 820879488508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 453014 + ... + 1359036.

It is an arithmetic number, because the mean of its divisors is an integer number (84826648004).

Almost surely, 2^820879488575 is an apocalyptic number.

820879488575 is a deficient number, since it is larger than the sum of its proper divisors (197040287473).

820879488575 is a wasteful number, since it uses less digits than its factorization.

820879488575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942274 (or 942269 counting only the distinct ones).

The product of its (nonzero) digits is 361267200, while the sum is 71.

The spelling of 820879488575 in words is "eight hundred twenty billion, eight hundred seventy-nine million, four hundred eighty-eight thousand, five hundred seventy-five".