28293654821 has 2 divisors, whose sum is σ = 28293654822. Its totient is φ = 28293654820.

The previous prime is 28293654793. The next prime is 28293654841. The reversal of 28293654821 is 12845639282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25660836100 + 2632818721 = 160190^2 + 51311^2 .

It is a cyclic number.

It is not a de Polignac number, because 28293654821 - 2⁶ = 28293654757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28293654821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28293654841) 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, 14146827410 + 14146827411.

It is an arithmetic number, because the mean of its divisors is an integer number (14146827411).

Almost surely, 2^28293654821 is an apocalyptic number.

It is an amenable number.

28293654821 is a deficient number, since it is larger than the sum of its proper divisors (1).

28293654821 is an equidigital number, since it uses as much as digits as its factorization.

28293654821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 50.

The spelling of 28293654821 in words is "twenty-eight billion, two hundred ninety-three million, six hundred fifty-four thousand, eight hundred twenty-one".