28878326417 has 2 divisors, whose sum is σ = 28878326418. Its totient is φ = 28878326416.

The previous prime is 28878326387. The next prime is 28878326459. The reversal of 28878326417 is 71462387882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28873146241 + 5180176 = 169921^2 + 2276^2 .

It is a cyclic number.

It is not a de Polignac number, because 28878326417 - 2¹⁸ = 28878064273 is a prime.

It is not a weakly prime, because it can be changed into another prime (28878326317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14439163208 + 14439163209.

It is an arithmetic number, because the mean of its divisors is an integer number (14439163209).

Almost surely, 2^28878326417 is an apocalyptic number.

It is an amenable number.

28878326417 is a deficient number, since it is larger than the sum of its proper divisors (1).

28878326417 is an equidigital number, since it uses as much as digits as its factorization.

28878326417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7225344, while the sum is 56.

The spelling of 28878326417 in words is "twenty-eight billion, eight hundred seventy-eight million, three hundred twenty-six thousand, four hundred seventeen".