280681009 has 8 divisors (see below), whose sum is σ = 323777088. Its totient is φ = 238334640.

The previous prime is 280681007. The next prime is 280681019. The reversal of 280681009 is 900186082.

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

It is a cyclic number.

It is not a de Polignac number, because 280681009 - 2¹ = 280681007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280681003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186622 + ... + 188119.

It is an arithmetic number, because the mean of its divisors is an integer number (40472136).

Almost surely, 2^280681009 is an apocalyptic number.

It is an amenable number.

280681009 is a deficient number, since it is larger than the sum of its proper divisors (43096079).

280681009 is a wasteful number, since it uses less digits than its factorization.

280681009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374855.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 280681009 is about 16753.5372086017. The cubic root of 280681009 is about 654.7432196666.

The spelling of 280681009 in words is "two hundred eighty million, six hundred eighty-one thousand, nine".