28784012652809 has 2 divisors, whose sum is σ = 28784012652810. Its totient is φ = 28784012652808.

The previous prime is 28784012652799. The next prime is 28784012652833. The reversal of 28784012652809 is 90825621048782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27067598238409 + 1716414414400 = 5202653^2 + 1310120^2 .

It is a cyclic number.

It is not a de Polignac number, because 28784012652809 - 2¹⁶ = 28784012587273 is a prime.

It is a super-3 number, since 3×28784012652809³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (28784012651809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14392006326404 + 14392006326405.

It is an arithmetic number, because the mean of its divisors is an integer number (14392006326405).

Almost surely, 2^{28784012652809} is an apocalyptic number.

It is an amenable number.

28784012652809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28784012652809 is an equidigital number, since it uses as much as digits as its factorization.

28784012652809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30965760, while the sum is 62.

The spelling of 28784012652809 in words is "twenty-eight trillion, seven hundred eighty-four billion, twelve million, six hundred fifty-two thousand, eight hundred nine".