28609813577 has 2 divisors, whose sum is σ = 28609813578. Its totient is φ = 28609813576.

The previous prime is 28609813537. The next prime is 28609813601. The reversal of 28609813577 is 77531890682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28306043536 + 303770041 = 168244^2 + 17429^2 .

It is a cyclic number.

It is not a de Polignac number, because 28609813577 - 2¹⁴ = 28609797193 is a prime.

It is not a weakly prime, because it can be changed into another prime (28609813517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14304906788 + 14304906789.

It is an arithmetic number, because the mean of its divisors is an integer number (14304906789).

Almost surely, 2^28609813577 is an apocalyptic number.

It is an amenable number.

28609813577 is a deficient number, since it is larger than the sum of its proper divisors (1).

28609813577 is an equidigital number, since it uses as much as digits as its factorization.

28609813577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 28609813577 in words is "twenty-eight billion, six hundred nine million, eight hundred thirteen thousand, five hundred seventy-seven".