28989421807 has 2 divisors, whose sum is σ = 28989421808. Its totient is φ = 28989421806.

The previous prime is 28989421781. The next prime is 28989421831. The reversal of 28989421807 is 70812498982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28989421807 - 2⁷ = 28989421679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28989421897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14494710903 + 14494710904.

It is an arithmetic number, because the mean of its divisors is an integer number (14494710904).

Almost surely, 2^28989421807 is an apocalyptic number.

28989421807 is a deficient number, since it is larger than the sum of its proper divisors (1).

28989421807 is an equidigital number, since it uses as much as digits as its factorization.

28989421807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4644864, while the sum is 58.

The spelling of 28989421807 in words is "twenty-eight billion, nine hundred eighty-nine million, four hundred twenty-one thousand, eight hundred seven".