8872717621 has 4 divisors (see below), whose sum is σ = 8994261772. Its totient is φ = 8751173472.

The previous prime is 8872717619. The next prime is 8872717663. The reversal of 8872717621 is 1267172788.

8872717621 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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 3092916996 + 5779800625 = 55614^2 + 76025^2 .

It is a cyclic number.

It is not a de Polignac number, because 8872717621 - 2¹ = 8872717619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8872717681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60771966 + ... + 60772111.

It is an arithmetic number, because the mean of its divisors is an integer number (2248565443).

Almost surely, 2^8872717621 is an apocalyptic number.

It is an amenable number.

8872717621 is a deficient number, since it is larger than the sum of its proper divisors (121544151).

8872717621 is a wasteful number, since it uses less digits than its factorization.

8872717621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121544150.

The product of its digits is 526848, while the sum is 49.

The square root of 8872717621 is about 94195.1040182026. The cubic root of 8872717621 is about 2070.2313775142.

The spelling of 8872717621 in words is "eight billion, eight hundred seventy-two million, seven hundred seventeen thousand, six hundred twenty-one".