280550880 has 72 divisors (see below), whose sum is σ = 957384792. Its totient is φ = 74813184.

The previous prime is 280550861. The next prime is 280550887. The reversal of 280550880 is 88055082.

280550880 is a `hidden beast` number, since 28 + 0 + 550 + 8 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280550887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95974 + ... + 98853.

It is an arithmetic number, because the mean of its divisors is an integer number (13297011).

Almost surely, 2^280550880 is an apocalyptic number.

280550880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280550880 is an abundant number, since it is smaller than the sum of its proper divisors (676833912).

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

280550880 is a wasteful number, since it uses less digits than its factorization.

280550880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194848 (or 194837 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The square root of 280550880 is about 16749.6531307368. The cubic root of 280550880 is about 654.6420202647.

The spelling of 280550880 in words is "two hundred eighty million, five hundred fifty thousand, eight hundred eighty".