28256267077 has 2 divisors, whose sum is σ = 28256267078. Its totient is φ = 28256267076.

The previous prime is 28256267071. The next prime is 28256267203. The reversal of 28256267077 is 77076265282.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28251222561 + 5044516 = 168081^2 + 2246^2 .

It is a cyclic number.

It is not a de Polignac number, because 28256267077 - 2⁷ = 28256266949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28256267071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14128133538 + 14128133539.

It is an arithmetic number, because the mean of its divisors is an integer number (14128133539).

Almost surely, 2^28256267077 is an apocalyptic number.

It is an amenable number.

28256267077 is a deficient number, since it is larger than the sum of its proper divisors (1).

28256267077 is an equidigital number, since it uses as much as digits as its factorization.

28256267077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3951360, while the sum is 52.

The spelling of 28256267077 in words is "twenty-eight billion, two hundred fifty-six million, two hundred sixty-seven thousand, seventy-seven".