28506878941 has 2 divisors, whose sum is σ = 28506878942. Its totient is φ = 28506878940.

The previous prime is 28506878923. The next prime is 28506878957. The reversal of 28506878941 is 14987860582.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18734765625 + 9772113316 = 136875^2 + 98854^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28506878941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28506878921) 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, 14253439470 + 14253439471.

It is an arithmetic number, because the mean of its divisors is an integer number (14253439471).

Almost surely, 2^28506878941 is an apocalyptic number.

It is an amenable number.

28506878941 is a deficient number, since it is larger than the sum of its proper divisors (1).

28506878941 is an equidigital number, since it uses as much as digits as its factorization.

28506878941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 28506878941 in words is "twenty-eight billion, five hundred six million, eight hundred seventy-eight thousand, nine hundred forty-one".