280555550 has 24 divisors (see below), whose sum is σ = 569273832. Its totient is φ = 102020000.

The previous prime is 280555547. The next prime is 280555559. The reversal of 280555550 is 55555082.

It is a happy number.

It is a super-2 number, since 2×280555550² = 157422833271605000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 280555550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280555559) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 254501 + ... + 255600.

It is an arithmetic number, because the mean of its divisors is an integer number (23719743).

Almost surely, 2^280555550 is an apocalyptic number.

280555550 is an abundant number, since it is smaller than the sum of its proper divisors (288718282).

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

280555550 is a wasteful number, since it uses less digits than its factorization.

280555550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510124 (or 510119 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 35.

The square root of 280555550 is about 16749.7925360286. The cubic root of 280555550 is about 654.6456525960.

The spelling of 280555550 in words is "two hundred eighty million, five hundred fifty-five thousand, five hundred fifty".