280670889 has 16 divisors (see below), whose sum is σ = 378058752. Its totient is φ = 185205888.

The previous prime is 280670861. The next prime is 280670893. The reversal of 280670889 is 988076082.

It is a happy number.

It is not a de Polignac number, because 280670889 - 2⁵ = 280670857 is a prime.

It is a super-2 number, since 2×280670889² = 157552295864100642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (280670809) 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, 294037 + ... + 294989.

It is an arithmetic number, because the mean of its divisors is an integer number (23628672).

Almost surely, 2^280670889 is an apocalyptic number.

It is an amenable number.

280670889 is a deficient number, since it is larger than the sum of its proper divisors (97387863).

280670889 is a wasteful number, since it uses less digits than its factorization.

280670889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 280670889 is about 16753.2351801078. The cubic root of 280670889 is about 654.7353506138.

The spelling of 280670889 in words is "two hundred eighty million, six hundred seventy thousand, eight hundred eighty-nine".