8831768821 has 4 divisors (see below), whose sum is σ = 9351284652. Its totient is φ = 8312252992.

The previous prime is 8831768801. The next prime is 8831768831. The reversal of 8831768821 is 1288671388.

It is a happy number.

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 6591166596 + 2240602225 = 81186^2 + 47335^2 .

It is a cyclic number.

It is not a de Polignac number, because 8831768821 - 2¹¹ = 8831766773 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 (8831768801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259757890 + ... + 259757923.

It is an arithmetic number, because the mean of its divisors is an integer number (2337821163).

Almost surely, 2^8831768821 is an apocalyptic number.

It is an amenable number.

8831768821 is a deficient number, since it is larger than the sum of its proper divisors (519515831).

8831768821 is a wasteful number, since it uses less digits than its factorization.

8831768821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519515830.

The product of its digits is 1032192, while the sum is 52.

The square root of 8831768821 is about 93977.4910337577. The cubic root of 8831768821 is about 2067.0416655830.

The spelling of 8831768821 in words is "eight billion, eight hundred thirty-one million, seven hundred sixty-eight thousand, eight hundred twenty-one".