291228 has 24 divisors (see below), whose sum is σ = 776832. Its totient is φ = 83184.

The previous prime is 291217. The next prime is 291253. The reversal of 291228 is 822192.

It is a junction number, because it is equal to n+sod(n) for n = 291198 and 291207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1650 + ... + 1817.

It is an arithmetic number, because the mean of its divisors is an integer number (32368).

2²⁹¹²²⁸ is an apocalyptic number.

291228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

291228 is an abundant number, since it is smaller than the sum of its proper divisors (485604).

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

291228 is a wasteful number, since it uses less digits than its factorization.

291228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3481 (or 3479 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 291228 is about 539.6554456317. The cubic root of 291228 is about 66.2843562162.

The spelling of 291228 in words is "two hundred ninety-one thousand, two hundred twenty-eight".