872538621668 has 48 divisors (see below), whose sum is σ = 1763986022400. Its totient is φ = 369913975200.

The previous prime is 872538621659. The next prime is 872538621683. The reversal of 872538621668 is 866126835278.

It is a happy number.

It is a super-2 number, since 2×872538621668² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 872538621668.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 578753 + ... + 1442231.

It is an arithmetic number, because the mean of its divisors is an integer number (36749708800).

Almost surely, 2^872538621668 is an apocalyptic number.

It is an amenable number.

872538621668 is an abundant number, since it is smaller than the sum of its proper divisors (891447400732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

872538621668 is a wasteful number, since it uses less digits than its factorization.

872538621668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863880 (or 863878 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 62.

The spelling of 872538621668 in words is "eight hundred seventy-two billion, five hundred thirty-eight million, six hundred twenty-one thousand, six hundred sixty-eight".