28921580749 has 2 divisors, whose sum is σ = 28921580750. Its totient is φ = 28921580748.

The previous prime is 28921580747. The next prime is 28921580813. The reversal of 28921580749 is 94708512982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25626246724 + 3295334025 = 160082^2 + 57405^2 .

It is a cyclic number.

It is not a de Polignac number, because 28921580749 - 2¹ = 28921580747 is a prime.

Together with 28921580747, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28921580749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28921580747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14460790374 + 14460790375.

It is an arithmetic number, because the mean of its divisors is an integer number (14460790375).

Almost surely, 2^28921580749 is an apocalyptic number.

It is an amenable number.

28921580749 is a deficient number, since it is larger than the sum of its proper divisors (1).

28921580749 is an equidigital number, since it uses as much as digits as its factorization.

28921580749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 28921580749 in words is "twenty-eight billion, nine hundred twenty-one million, five hundred eighty thousand, seven hundred forty-nine".