280016889 has 16 divisors (see below), whose sum is σ = 394521600. Its totient is φ = 176170896.

The previous prime is 280016827. The next prime is 280016899. The reversal of 280016889 is 988610082.

It is not a de Polignac number, because 280016889 - 2⁷ = 280016761 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 280016889.

It is not an unprimeable number, because it can be changed into a prime (280016819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5652 + ... + 24330.

It is an arithmetic number, because the mean of its divisors is an integer number (24657600).

Almost surely, 2^280016889 is an apocalyptic number.

It is an amenable number.

280016889 is a deficient number, since it is larger than the sum of its proper divisors (114504711).

280016889 is a wasteful number, since it uses less digits than its factorization.

280016889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18964.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 280016889 is about 16733.7051784714. The cubic root of 280016889 is about 654.2264153540.

The spelling of 280016889 in words is "two hundred eighty million, sixteen thousand, eight hundred eighty-nine".