280900240 has 40 divisors (see below), whose sum is σ = 653853240. Its totient is φ = 112229376.

The previous prime is 280900223. The next prime is 280900271. The reversal of 280900240 is 42009082.

280900240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 129413376 + 151486864 = 11376^2 + 12308^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 96892 + ... + 99748.

It is an arithmetic number, because the mean of its divisors is an integer number (16346331).

Almost surely, 2^280900240 is an apocalyptic number.

280900240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280900240 is an abundant number, since it is smaller than the sum of its proper divisors (372953000).

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

280900240 is a wasteful number, since it uses less digits than its factorization.

280900240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099 (or 4093 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 280900240 is about 16760.0787587648. The cubic root of 280900240 is about 654.9136416651.

The spelling of 280900240 in words is "two hundred eighty million, nine hundred thousand, two hundred forty".