28563197077 has 2 divisors, whose sum is σ = 28563197078. Its totient is φ = 28563197076.

The previous prime is 28563197051. The next prime is 28563197081. The reversal of 28563197077 is 77079136582.

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., 28372370481 + 190826596 = 168441^2 + 13814^2 .

It is a cyclic number.

It is not a de Polignac number, because 28563197077 - 2¹⁵ = 28563164309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28563197027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14281598538 + 14281598539.

It is an arithmetic number, because the mean of its divisors is an integer number (14281598539).

Almost surely, 2^28563197077 is an apocalyptic number.

It is an amenable number.

28563197077 is a deficient number, since it is larger than the sum of its proper divisors (1).

28563197077 is an equidigital number, since it uses as much as digits as its factorization.

28563197077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4445280, while the sum is 55.

The spelling of 28563197077 in words is "twenty-eight billion, five hundred sixty-three million, one hundred ninety-seven thousand, seventy-seven".