28773332921 has 2 divisors, whose sum is σ = 28773332922. Its totient is φ = 28773332920.

The previous prime is 28773332909. The next prime is 28773332927. The reversal of 28773332921 is 12923337782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26388378025 + 2384954896 = 162445^2 + 48836^2 .

It is a cyclic number.

It is not a de Polignac number, because 28773332921 - 2⁶ = 28773332857 is a prime.

It is not a weakly prime, because it can be changed into another prime (28773332927) 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 as a sum of consecutive naturals, namely, 14386666460 + 14386666461.

It is an arithmetic number, because the mean of its divisors is an integer number (14386666461).

Almost surely, 2^28773332921 is an apocalyptic number.

It is an amenable number.

28773332921 is a deficient number, since it is larger than the sum of its proper divisors (1).

28773332921 is an equidigital number, since it uses as much as digits as its factorization.

28773332921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 47.

The spelling of 28773332921 in words is "twenty-eight billion, seven hundred seventy-three million, three hundred thirty-two thousand, nine hundred twenty-one".