28080280691 has 2 divisors, whose sum is σ = 28080280692. Its totient is φ = 28080280690.

The previous prime is 28080280559. The next prime is 28080280703. The reversal of 28080280691 is 19608208082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28080280691 - 2¹⁴ = 28080264307 is a prime.

It is not a weakly prime, because it can be changed into another prime (28080280391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040140345 + 14040140346.

It is an arithmetic number, because the mean of its divisors is an integer number (14040140346).

Almost surely, 2^28080280691 is an apocalyptic number.

28080280691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28080280691 is an equidigital number, since it uses as much as digits as its factorization.

28080280691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 28080280691 in words is "twenty-eight billion, eighty million, two hundred eighty thousand, six hundred ninety-one".