280000289999 has 4 divisors (see below), whose sum is σ = 282772570200. Its totient is φ = 277228009800.

The previous prime is 280000289971. The next prime is 280000290023. The reversal of 280000289999 is 999982000082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280000289999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280000289929) 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, 1386139949 + ... + 1386140150.

It is an arithmetic number, because the mean of its divisors is an integer number (70693142550).

Almost surely, 2^280000289999 is an apocalyptic number.

280000289999 is a deficient number, since it is larger than the sum of its proper divisors (2772280201).

280000289999 is a wasteful number, since it uses less digits than its factorization.

280000289999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2772280200.

The product of its (nonzero) digits is 1679616, while the sum is 56.

It can be divided in two parts, 28000028 and 9999, that multiplied together give a palindrome (279972279972).

The spelling of 280000289999 in words is "two hundred eighty billion, two hundred eighty-nine thousand, nine hundred ninety-nine".