280030073 has 4 divisors (see below), whose sum is σ = 280069968. Its totient is φ = 279990180.

The previous prime is 280030063. The next prime is 280030087. The reversal of 280030073 is 370030082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 280030073 - 2⁴ = 280030057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (280030043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6311 + ... + 24492.

It is an arithmetic number, because the mean of its divisors is an integer number (70017492).

Almost surely, 2^280030073 is an apocalyptic number.

It is an amenable number.

280030073 is a deficient number, since it is larger than the sum of its proper divisors (39895).

280030073 is an equidigital number, since it uses as much as digits as its factorization.

280030073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39894.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 280030073 is about 16734.0991093037. The cubic root of 280030073 is about 654.2366828129.

Subtracting 280030073 from its reverse (370030082), we obtain a palindrome (90000009).

The spelling of 280030073 in words is "two hundred eighty million, thirty thousand, seventy-three".