28878055009 has 2 divisors, whose sum is σ = 28878055010. Its totient is φ = 28878055008.

The previous prime is 28878054977. The next prime is 28878055021. The reversal of 28878055009 is 90055087882.

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., 28593795409 + 284259600 = 169097^2 + 16860^2 .

It is a cyclic number.

It is not a de Polignac number, because 28878055009 - 2⁵ = 28878054977 is a prime.

It is a super-2 number, since 2×28878055009² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28878050009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14439027504 + 14439027505.

It is an arithmetic number, because the mean of its divisors is an integer number (14439027505).

Almost surely, 2^28878055009 is an apocalyptic number.

It is an amenable number.

28878055009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28878055009 is an equidigital number, since it uses as much as digits as its factorization.

28878055009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1612800, while the sum is 52.

The spelling of 28878055009 in words is "twenty-eight billion, eight hundred seventy-eight million, fifty-five thousand, nine".