28930439869 has 2 divisors, whose sum is σ = 28930439870. Its totient is φ = 28930439868.

The previous prime is 28930439849. The next prime is 28930439887. The reversal of 28930439869 is 96893403982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28928907225 + 1532644 = 170085^2 + 1238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28930439869 is a prime.

It is a super-2 number, since 2×28930439869² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28930439849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14465219934 + 14465219935.

It is an arithmetic number, because the mean of its divisors is an integer number (14465219935).

Almost surely, 2^28930439869 is an apocalyptic number.

It is an amenable number.

28930439869 is a deficient number, since it is larger than the sum of its proper divisors (1).

28930439869 is an equidigital number, since it uses as much as digits as its factorization.

28930439869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20155392, while the sum is 61.

The spelling of 28930439869 in words is "twenty-eight billion, nine hundred thirty million, four hundred thirty-nine thousand, eight hundred sixty-nine".