10828691721 has 9 divisors (see below), whose sum is σ = 15641894541. Its totient is φ = 7218919692.

The previous prime is 10828691701. The next prime is 10828691743. The reversal of 10828691721 is 12719682801.

The square root of 10828691721 is 104061.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 10828691721 - 2¹¹ = 10828689673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10828691701) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 294840 + ... + 329526.

Almost surely, 2^10828691721 is an apocalyptic number.

10828691721 is the 104061-st square number.

10828691721 is the 52031-st centered octagonal number.

It is an amenable number.

10828691721 is a deficient number, since it is larger than the sum of its proper divisors (4813202820).

10828691721 is an frugal number, since it uses more digits than its factorization.

10828691721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69380 (or 34690 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The spelling of 10828691721 in words is "ten billion, eight hundred twenty-eight million, six hundred ninety-one thousand, seven hundred twenty-one".