872821617 has 8 divisors (see below), whose sum is σ = 1175760096. Its totient is φ = 575882112.

The previous prime is 872821603. The next prime is 872821619. The reversal of 872821617 is 716128278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 872821617 - 2¹¹ = 872819569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (872821619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1499403 + ... + 1499984.

It is an arithmetic number, because the mean of its divisors is an integer number (146970012).

Almost surely, 2^872821617 is an apocalyptic number.

It is an amenable number.

872821617 is a deficient number, since it is larger than the sum of its proper divisors (302938479).

872821617 is a wasteful number, since it uses less digits than its factorization.

872821617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999487.

The product of its digits is 75264, while the sum is 42.

The square root of 872821617 is about 29543.5545762523. The cubic root of 872821617 is about 955.6711990686.

The spelling of 872821617 in words is "eight hundred seventy-two million, eight hundred twenty-one thousand, six hundred seventeen".