275231220 has 48 divisors (see below), whose sum is σ = 840708288. Its totient is φ = 66722560.

The previous prime is 275231189. The next prime is 275231221. The reversal of 275231220 is 22132572.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275231221) 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, 207849 + ... + 209168.

It is an arithmetic number, because the mean of its divisors is an integer number (17514756).

Almost surely, 2^275231220 is an apocalyptic number.

275231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

275231220 is an abundant number, since it is smaller than the sum of its proper divisors (565477068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

275231220 is a wasteful number, since it uses less digits than its factorization.

275231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417040 (or 417038 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 275231220 is about 16590.0940322832. The cubic root of 275231220 is about 650.4779285840.

Adding to 275231220 its reverse (22132572), we get a palindrome (297363792).

The spelling of 275231220 in words is "two hundred seventy-five million, two hundred thirty-one thousand, two hundred twenty".