28386939961 has 2 divisors, whose sum is σ = 28386939962. Its totient is φ = 28386939960.

The previous prime is 28386939953. The next prime is 28386940019. The reversal of 28386939961 is 16993968382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17336725561 + 11050214400 = 131669^2 + 105120^2 .

It is a cyclic number.

It is not a de Polignac number, because 28386939961 - 2³ = 28386939953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28386939893 and 28386939902.

It is not a weakly prime, because it can be changed into another prime (28386939901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14193469980 + 14193469981.

It is an arithmetic number, because the mean of its divisors is an integer number (14193469981).

Almost surely, 2^28386939961 is an apocalyptic number.

It is an amenable number.

28386939961 is a deficient number, since it is larger than the sum of its proper divisors (1).

28386939961 is an equidigital number, since it uses as much as digits as its factorization.

28386939961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30233088, while the sum is 64.

The spelling of 28386939961 in words is "twenty-eight billion, three hundred eighty-six million, nine hundred thirty-nine thousand, nine hundred sixty-one".