28080821429 has 2 divisors, whose sum is σ = 28080821430. Its totient is φ = 28080821428.

The previous prime is 28080821413. The next prime is 28080821441. The reversal of 28080821429 is 92412808082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14139588100 + 13941233329 = 118910^2 + 118073^2 .

It is a cyclic number.

It is not a de Polignac number, because 28080821429 - 2⁴ = 28080821413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28080821429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28080821479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040410714 + 14040410715.

It is an arithmetic number, because the mean of its divisors is an integer number (14040410715).

Almost surely, 2^28080821429 is an apocalyptic number.

It is an amenable number.

28080821429 is a deficient number, since it is larger than the sum of its proper divisors (1).

28080821429 is an equidigital number, since it uses as much as digits as its factorization.

28080821429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147456, while the sum is 44.

The spelling of 28080821429 in words is "twenty-eight billion, eighty million, eight hundred twenty-one thousand, four hundred twenty-nine".