280012889 has 12 divisors (see below), whose sum is σ = 307376316. Its totient is φ = 254921472.

The previous prime is 280012871. The next prime is 280012913. The reversal of 280012889 is 988210082.

It can be written as a sum of positive squares in 6 ways, for example, as 123387664 + 156625225 = 11108^2 + 12515^2 .

It is not a de Polignac number, because 280012889 - 2¹² = 280008793 is a prime.

It is a super-2 number, since 2×280012889² = 156814436012252642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (280012819) 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 in 11 ways as a sum of consecutive naturals, for example, 989 + ... + 23685.

It is an arithmetic number, because the mean of its divisors is an integer number (25614693).

Almost surely, 2^280012889 is an apocalyptic number.

It is an amenable number.

280012889 is a deficient number, since it is larger than the sum of its proper divisors (27363427).

280012889 is a wasteful number, since it uses less digits than its factorization.

280012889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22796 (or 22783 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 280012889 is about 16733.5856587881. The cubic root of 280012889 is about 654.2233001631.

The spelling of 280012889 in words is "two hundred eighty million, twelve thousand, eight hundred eighty-nine".