28668923761 has 3 divisors (see below), whose sum is σ = 28669093081. Its totient is φ = 28668754442.

The previous prime is 28668923753. The next prime is 28668923797. The reversal of 28668923761 is 16732986682.

The square root of 28668923761 is 169319.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 28668923761 - 2³ = 28668923753 is a prime.

It is a super-2 number, since 2×28668923761² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28668923696 and 28668923705.

It is not an unprimeable number, because it can be changed into a prime (28668923711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 84660 + ... + 253978.

Almost surely, 2^28668923761 is an apocalyptic number.

28668923761 is the 169319-th square number.

28668923761 is the 84660-th centered octagonal number.

It is an amenable number.

28668923761 is a deficient number, since it is larger than the sum of its proper divisors (169320).

28668923761 is an frugal number, since it uses more digits than its factorization.

28668923761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338638 (or 169319 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 58.

The spelling of 28668923761 in words is "twenty-eight billion, six hundred sixty-eight million, nine hundred twenty-three thousand, seven hundred sixty-one".