28555415309 has 2 divisors, whose sum is σ = 28555415310. Its totient is φ = 28555415308.

The previous prime is 28555415303. The next prime is 28555415323. The reversal of 28555415309 is 90351455582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24235639684 + 4319775625 = 155678^2 + 65725^2 .

It is a cyclic number.

It is not a de Polignac number, because 28555415309 - 2⁴ = 28555415293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28555415303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14277707654 + 14277707655.

It is an arithmetic number, because the mean of its divisors is an integer number (14277707655).

Almost surely, 2^28555415309 is an apocalyptic number.

It is an amenable number.

28555415309 is a deficient number, since it is larger than the sum of its proper divisors (1).

28555415309 is an equidigital number, since it uses as much as digits as its factorization.

28555415309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080000, while the sum is 47.

The spelling of 28555415309 in words is "twenty-eight billion, five hundred fifty-five million, four hundred fifteen thousand, three hundred nine".