280328331 has 4 divisors (see below), whose sum is σ = 373771112. Its totient is φ = 186885552.

The previous prime is 280328327. The next prime is 280328333. The reversal of 280328331 is 133823082.

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

It is not a de Polignac number, because 280328331 - 2² = 280328327 is a prime.

It is a super-2 number, since 2×280328331² = 157167946322491122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280328333) 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, 46721386 + ... + 46721391.

It is an arithmetic number, because the mean of its divisors is an integer number (93442778).

Almost surely, 2^280328331 is an apocalyptic number.

280328331 is a deficient number, since it is larger than the sum of its proper divisors (93442781).

280328331 is an equidigital number, since it uses as much as digits as its factorization.

280328331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93442780.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 280328331 is about 16743.0084214277. The cubic root of 280328331 is about 654.4688746459.

It can be divided in two parts, 28032 and 8331, that added together give a palindrome (36363).

The spelling of 280328331 in words is "two hundred eighty million, three hundred twenty-eight thousand, three hundred thirty-one".