28687292969 has 2 divisors, whose sum is σ = 28687292970. Its totient is φ = 28687292968.

The previous prime is 28687292947. The next prime is 28687293043. The reversal of 28687292969 is 96929278682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18882332569 + 9804960400 = 137413^2 + 99020^2 .

It is a cyclic number.

It is not a de Polignac number, because 28687292969 - 2⁸ = 28687292713 is a prime.

It is a super-2 number, since 2×28687292969² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28687292899 and 28687292908.

It is not a weakly prime, because it can be changed into another prime (28687292269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14343646484 + 14343646485.

It is an arithmetic number, because the mean of its divisors is an integer number (14343646485).

Almost surely, 2^28687292969 is an apocalyptic number.

It is an amenable number.

28687292969 is a deficient number, since it is larger than the sum of its proper divisors (1).

28687292969 is an equidigital number, since it uses as much as digits as its factorization.

28687292969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94058496, while the sum is 68.

The spelling of 28687292969 in words is "twenty-eight billion, six hundred eighty-seven million, two hundred ninety-two thousand, nine hundred sixty-nine".