280555500 has 96 divisors (see below), whose sum is σ = 832628160. Its totient is φ = 73382400.

The previous prime is 280555493. The next prime is 280555519. The reversal of 280555500 is 5555082.

280555500 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×280555500² = 157422777160500000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

280555500 is strictly pandigital in base 9.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77736 + ... + 81264.

It is an arithmetic number, because the mean of its divisors is an integer number (8673210).

Almost surely, 2^280555500 is an apocalyptic number.

280555500 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 280555500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (416314080).

280555500 is an abundant number, since it is smaller than the sum of its proper divisors (552072660).

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

280555500 is a wasteful number, since it uses less digits than its factorization.

280555500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604 (or 3592 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 280555500 is about 16749.7910434728. The cubic root of 280555500 is about 654.6456137062.

The spelling of 280555500 in words is "two hundred eighty million, five hundred fifty-five thousand, five hundred".