280412805 has 16 divisors (see below), whose sum is σ = 449032320. Its totient is φ = 149429568.

The previous prime is 280412801. The next prime is 280412809. The reversal of 280412805 is 508214082.

It is an interprime number because it is at equal distance from previous prime (280412801) and next prime (280412809).

It is not a de Polignac number, because 280412805 - 2² = 280412801 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280412801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12699 + ... + 26871.

It is an arithmetic number, because the mean of its divisors is an integer number (28064520).

Almost surely, 2^280412805 is an apocalyptic number.

It is an amenable number.

280412805 is a deficient number, since it is larger than the sum of its proper divisors (168619515).

280412805 is a wasteful number, since it uses less digits than its factorization.

280412805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15500.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 280412805 is about 16745.5308963317. The cubic root of 280412805 is about 654.5346071522.

Adding to 280412805 its reverse (508214082), we get a palindrome (788626887).

The spelling of 280412805 in words is "two hundred eighty million, four hundred twelve thousand, eight hundred five".