28129956773377 has 2 divisors, whose sum is σ = 28129956773378. Its totient is φ = 28129956773376.

The previous prime is 28129956773351. The next prime is 28129956773407. The reversal of 28129956773377 is 77337765992182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26763281208976 + 1366675564401 = 5173324^2 + 1169049^2 .

It is a cyclic number.

It is not a de Polignac number, because 28129956773377 - 2⁷ = 28129956773249 is a prime.

It is not a weakly prime, because it can be changed into another prime (28129956773327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14064978386688 + 14064978386689.

It is an arithmetic number, because the mean of its divisors is an integer number (14064978386689).

Almost surely, 2^{28129956773377} is an apocalyptic number.

It is an amenable number.

28129956773377 is a deficient number, since it is larger than the sum of its proper divisors (1).

28129956773377 is an equidigital number, since it uses as much as digits as its factorization.

28129956773377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680315840, while the sum is 76.

The spelling of 28129956773377 in words is "twenty-eight trillion, one hundred twenty-nine billion, nine hundred fifty-six million, seven hundred seventy-three thousand, three hundred seventy-seven".