28321525777 has 2 divisors, whose sum is σ = 28321525778. Its totient is φ = 28321525776.

The previous prime is 28321525769. The next prime is 28321525781. The reversal of 28321525777 is 77752512382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22728879121 + 5592646656 = 150761^2 + 74784^2 .

It is a cyclic number.

It is not a de Polignac number, because 28321525777 - 2³ = 28321525769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28321525777.

It is not a weakly prime, because it can be changed into another prime (28321525747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160762888 + 14160762889.

It is an arithmetic number, because the mean of its divisors is an integer number (14160762889).

Almost surely, 2^28321525777 is an apocalyptic number.

It is an amenable number.

28321525777 is a deficient number, since it is larger than the sum of its proper divisors (1).

28321525777 is an equidigital number, since it uses as much as digits as its factorization.

28321525777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1646400, while the sum is 49.

The spelling of 28321525777 in words is "twenty-eight billion, three hundred twenty-one million, five hundred twenty-five thousand, seven hundred seventy-seven".