280085128 has 16 divisors (see below), whose sum is σ = 525749760. Its totient is φ = 139885200.

The previous prime is 280085089. The next prime is 280085147. The reversal of 280085128 is 821580082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 280085093 and 280085102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11928 + ... + 26503.

It is an arithmetic number, because the mean of its divisors is an integer number (32859360).

Almost surely, 2^280085128 is an apocalyptic number.

It is an amenable number.

280085128 is a deficient number, since it is larger than the sum of its proper divisors (245664632).

280085128 is a wasteful number, since it uses less digits than its factorization.

280085128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39348 (or 39344 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 280085128 is about 16735.7440228990. The cubic root of 280085128 is about 654.2795551610.

The spelling of 280085128 in words is "two hundred eighty million, eighty-five thousand, one hundred twenty-eight".