291228768 has 108 divisors (see below), whose sum is σ = 880015500. Its totient is φ = 91339776.

The previous prime is 291228767. The next prime is 291228803. The reversal of 291228768 is 867822192.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291228761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 81483 + ... + 84981.

Almost surely, 2^291228768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 291228768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (440007750).

291228768 is an abundant number, since it is smaller than the sum of its proper divisors (588786732).

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

291228768 is a wasteful number, since it uses less digits than its factorization.

291228768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3549 (or 3521 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 291228768 is about 17065.4261007453. The cubic root of 291228768 is about 662.8441448247.

The spelling of 291228768 in words is "two hundred ninety-one million, two hundred twenty-eight thousand, seven hundred sixty-eight".