278845231 has 6 divisors (see below), whose sum is σ = 324371040. Its totient is φ = 239010156.

The previous prime is 278845201. The next prime is 278845247. The reversal of 278845231 is 132548872.

It is a happy number.

It is not a de Polignac number, because 278845231 - 2¹⁹ = 278320943 is a prime.

It is a super-2 number, since 2×278845231² = 155509325702886722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278845201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2845311 + ... + 2845408.

It is an arithmetic number, because the mean of its divisors is an integer number (54061840).

Almost surely, 2^278845231 is an apocalyptic number.

278845231 is a deficient number, since it is larger than the sum of its proper divisors (45525809).

278845231 is an equidigital number, since it uses as much as digits as its factorization.

278845231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5690733 (or 5690726 counting only the distinct ones).

The product of its digits is 107520, while the sum is 40.

The square root of 278845231 is about 16698.6595569824. The cubic root of 278845231 is about 653.3126594932.

The spelling of 278845231 in words is "two hundred seventy-eight million, eight hundred forty-five thousand, two hundred thirty-one".