280488728 has 16 divisors (see below), whose sum is σ = 566371680. Its totient is φ = 129456288.

The previous prime is 280488707. The next prime is 280488743. The reversal of 280488728 is 827884082.

It is a happy number.

It is a congruent number.

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, 1348400 + ... + 1348607.

It is an arithmetic number, because the mean of its divisors is an integer number (35398230).

Almost surely, 2^280488728 is an apocalyptic number.

It is an amenable number.

280488728 is an abundant number, since it is smaller than the sum of its proper divisors (285882952).

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

280488728 is a wasteful number, since it uses less digits than its factorization.

280488728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2697026 (or 2697022 counting only the distinct ones).

The product of its (nonzero) digits is 458752, while the sum is 47.

The square root of 280488728 is about 16747.7977059672. The cubic root of 280488728 is about 654.5936745293.

The spelling of 280488728 in words is "two hundred eighty million, four hundred eighty-eight thousand, seven hundred twenty-eight".