278047231 has 20 divisors (see below), whose sum is σ = 349671760. Its totient is φ = 216580320.

The previous prime is 278047229. The next prime is 278047247. The reversal of 278047231 is 132740872.

It is not a de Polignac number, because 278047231 - 2¹ = 278047229 is a prime.

It is a super-2 number, since 2×278047231² = 154620525333534722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278047031) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 101131 + ... + 103843.

It is an arithmetic number, because the mean of its divisors is an integer number (17483588).

Almost surely, 2^278047231 is an apocalyptic number.

278047231 is a deficient number, since it is larger than the sum of its proper divisors (71624529).

278047231 is an frugal number, since it uses more digits than its factorization.

278047231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764 (or 2731 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 278047231 is about 16674.7483039475. The cubic root of 278047231 is about 652.6888467543.

The spelling of 278047231 in words is "two hundred seventy-eight million, forty-seven thousand, two hundred thirty-one".