280000001 has 8 divisors (see below), whose sum is σ = 281321280. Its totient is φ = 278682768.

The previous prime is 279999991. The next prime is 280000027. The reversal of 280000001 is 100000082.

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 280000001 - 2¹⁰ = 279998977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280002001) 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, 304220 + ... + 305138.

It is an arithmetic number, because the mean of its divisors is an integer number (35165160).

Almost surely, 2^280000001 is an apocalyptic number.

It is an amenable number.

280000001 is a deficient number, since it is larger than the sum of its proper divisors (1321279).

280000001 is an equidigital number, since it uses as much as digits as its factorization.

280000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 280000001 is about 16733.2005605622. The cubic root of 280000001 is about 654.2132628165.

Adding to 280000001 its reverse (100000082), we get a palindrome (380000083).

The spelling of 280000001 in words is "two hundred eighty million, one", and thus it is an aban number.