280883640 has 32 divisors (see below), whose sum is σ = 842651280. Its totient is φ = 74902272.

The previous prime is 280883569. The next prime is 280883657. The reversal of 280883640 is 46388082.

280883640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1170229 + ... + 1170468.

Almost surely, 2^280883640 is an apocalyptic number.

280883640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280883640 is an abundant number, since it is smaller than the sum of its proper divisors (561767640).

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

280883640 is a wasteful number, since it uses less digits than its factorization.

280883640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340711 (or 2340707 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 280883640 is about 16759.5835270451. The cubic root of 280883640 is about 654.9007405481.

The spelling of 280883640 in words is "two hundred eighty million, eight hundred eighty-three thousand, six hundred forty".