280863040 has 56 divisors (see below), whose sum is σ = 674168832. Its totient is φ = 111444480.

The previous prime is 280863019. The next prime is 280863053. The reversal of 280863040 is 40368082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 280862993 and 280863011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37185 + ... + 44095.

Almost surely, 2^280863040 is an apocalyptic number.

280863040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280863040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337084416).

280863040 is an abundant number, since it is smaller than the sum of its proper divisors (393305792).

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

280863040 is a wasteful number, since it uses less digits than its factorization.

280863040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7055 (or 7045 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 280863040 is about 16758.9689420322. The cubic root of 280863040 is about 654.8847300214.

The spelling of 280863040 in words is "two hundred eighty million, eight hundred sixty-three thousand, forty".