280678128 has 80 divisors (see below), whose sum is σ = 749285376. Its totient is φ = 90478080.

The previous prime is 280678117. The next prime is 280678147. The reversal of 280678128 is 821876082.

It is a self number, because there is not a number n which added to its sum of digits gives 280678128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249375 + ... + 250497.

Almost surely, 2^280678128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280678128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374642688).

280678128 is an abundant number, since it is smaller than the sum of its proper divisors (468607248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280678128 is a wasteful number, since it uses less digits than its factorization.

280678128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 280678128 is about 16753.4512265384. The cubic root of 280678128 is about 654.7409794941.

The spelling of 280678128 in words is "two hundred eighty million, six hundred seventy-eight thousand, one hundred twenty-eight".