280328231 has 4 divisors (see below), whose sum is σ = 280503000. Its totient is φ = 280153464.

The previous prime is 280328221. The next prime is 280328233. The reversal of 280328231 is 132823082.

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

It is a cyclic number.

It is not a de Polignac number, because 280328231 - 2¹⁴ = 280311847 is a prime.

It is a super-2 number, since 2×280328231² = 157167834191178722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 280328194 and 280328203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280328233) 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, 84956 + ... + 88193.

It is an arithmetic number, because the mean of its divisors is an integer number (70125750).

Almost surely, 2^280328231 is an apocalyptic number.

280328231 is a deficient number, since it is larger than the sum of its proper divisors (174769).

280328231 is a wasteful number, since it uses less digits than its factorization.

280328231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174768.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 280328231 is about 16743.0054351063. The cubic root of 280328231 is about 654.4687968242.

It can be divided in two parts, 28032 and 8231, that added together give a palindrome (36263).

The spelling of 280328231 in words is "two hundred eighty million, three hundred twenty-eight thousand, two hundred thirty-one".