280000555 has 4 divisors (see below), whose sum is σ = 336000672. Its totient is φ = 224000440.

The previous prime is 280000543. The next prime is 280000561. The reversal of 280000555 is 555000082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 280000555 - 2⁹ = 280000043 is a prime.

It is a Duffinian number.

280000555 is a modest number, since divided by 555 gives 280 as remainder.

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, 28000051 + ... + 28000060.

It is an arithmetic number, because the mean of its divisors is an integer number (84000168).

Almost surely, 2^280000555 is an apocalyptic number.

280000555 is a deficient number, since it is larger than the sum of its proper divisors (56000117).

280000555 is an equidigital number, since it uses as much as digits as its factorization.

280000555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56000116.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 280000555 is about 16733.2171144702. The cubic root of 280000555 is about 654.2136942855.

The spelling of 280000555 in words is "two hundred eighty million, five hundred fifty-five", and thus it is an aban number.