280672656 has 80 divisors (see below), whose sum is σ = 802234368. Its totient is φ = 83843200.

The previous prime is 280672621. The next prime is 280672661. The reversal of 280672656 is 656276082.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33745 + ... + 41231.

Almost surely, 2^280672656 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 280672656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (401117184).

280672656 is an abundant number, since it is smaller than the sum of its proper divisors (521561712).

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

280672656 is a wasteful number, since it uses less digits than its factorization.

280672656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7580 (or 7574 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 280672656 is about 16753.2879161077. The cubic root of 280672656 is about 654.7367246014.

The spelling of 280672656 in words is "two hundred eighty million, six hundred seventy-two thousand, six hundred fifty-six".