280028903449 has 2 divisors, whose sum is σ = 280028903450. Its totient is φ = 280028903448.

The previous prime is 280028903339. The next prime is 280028903507. The reversal of 280028903449 is 944309820082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235826784400 + 44202119049 = 485620^2 + 210243^2 .

It is a cyclic number.

It is not a de Polignac number, because 280028903449 - 2¹¹ = 280028901401 is a prime.

It is not a weakly prime, because it can be changed into another prime (280028906449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140014451724 + 140014451725.

It is an arithmetic number, because the mean of its divisors is an integer number (140014451725).

Almost surely, 2^280028903449 is an apocalyptic number.

It is an amenable number.

280028903449 is a deficient number, since it is larger than the sum of its proper divisors (1).

280028903449 is an equidigital number, since it uses as much as digits as its factorization.

280028903449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 280028903449 in words is "two hundred eighty billion, twenty-eight million, nine hundred three thousand, four hundred forty-nine".