280000730 has 8 divisors (see below), whose sum is σ = 504001332. Its totient is φ = 112000288.

The previous prime is 280000697. The next prime is 280000751. The reversal of 280000730 is 37000082.

It can be written as a sum of positive squares in 2 ways, for example, as 277588921 + 2411809 = 16661^2 + 1553^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 14000027 + ... + 14000046.

Almost surely, 2^280000730 is an apocalyptic number.

280000730 is a deficient number, since it is larger than the sum of its proper divisors (224000602).

280000730 is a wasteful number, since it uses less digits than its factorization.

280000730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28000080.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 280000730 is about 16733.2223435894. Note that the first 3 decimals coincide. The cubic root of 280000730 is about 654.2138305797.

The spelling of 280000730 in words is "two hundred eighty million, seven hundred thirty", and thus it is an aban number.