280000000305 has 24 divisors (see below), whose sum is σ = 495659578752. Its totient is φ = 146156027424.

The previous prime is 280000000289. The next prime is 280000000307. The reversal of 280000000305 is 503000000082.

It is not a de Polignac number, because 280000000305 - 2⁴ = 280000000289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280000000307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66191739 + ... + 66195968.

It is an arithmetic number, because the mean of its divisors is an integer number (20652482448).

Almost surely, 2^280000000305 is an apocalyptic number.

It is an amenable number.

280000000305 is a deficient number, since it is larger than the sum of its proper divisors (215659578447).

280000000305 is a wasteful number, since it uses less digits than its factorization.

280000000305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132387765 (or 132387762 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 280000000305 its reverse (503000000082), we get a palindrome (783000000387).

The spelling of 280000000305 in words is "two hundred eighty billion, three hundred five", and thus it is an aban number.