280820077 has 2 divisors, whose sum is σ = 280820078. Its totient is φ = 280820076.

The previous prime is 280820053. The next prime is 280820081. The reversal of 280820077 is 770028082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245047716 + 35772361 = 15654^2 + 5981^2 .

It is a cyclic number.

It is not a de Polignac number, because 280820077 - 2²³ = 272431469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280820677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140410038 + 140410039.

It is an arithmetic number, because the mean of its divisors is an integer number (140410039).

Almost surely, 2^280820077 is an apocalyptic number.

It is an amenable number.

280820077 is a deficient number, since it is larger than the sum of its proper divisors (1).

280820077 is an equidigital number, since it uses as much as digits as its factorization.

280820077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 280820077 is about 16757.6871017453. The cubic root of 280820077 is about 654.8513362275.

The spelling of 280820077 in words is "two hundred eighty million, eight hundred twenty thousand, seventy-seven".