280089993 has 4 divisors (see below), whose sum is σ = 373453328. Its totient is φ = 186726660.

The previous prime is 280089961. The next prime is 280090043. The reversal of 280089993 is 399980082.

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 not a de Polignac number, because 280089993 - 2⁵ = 280089961 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 (280089923) by changing a digit.

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, 46681663 + ... + 46681668.

It is an arithmetic number, because the mean of its divisors is an integer number (93363332).

Almost surely, 2^280089993 is an apocalyptic number.

It is an amenable number.

280089993 is a deficient number, since it is larger than the sum of its proper divisors (93363335).

280089993 is an equidigital number, since it uses as much as digits as its factorization.

280089993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93363334.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 280089993 is about 16735.8893698542. The cubic root of 280089993 is about 654.2833433564.

The spelling of 280089993 in words is "two hundred eighty million, eighty-nine thousand, nine hundred ninety-three".