291868428 has 48 divisors (see below), whose sum is σ = 691004160. Its totient is φ = 95874624.

The previous prime is 291868417. The next prime is 291868429. The reversal of 291868428 is 824868192.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (291868429) 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 15 ways as a sum of consecutive naturals, for example, 296425 + ... + 297407.

It is an arithmetic number, because the mean of its divisors is an integer number (14395920).

Almost surely, 2^291868428 is an apocalyptic number.

It is an amenable number.

291868428 is an abundant number, since it is smaller than the sum of its proper divisors (399135732).

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

291868428 is a wasteful number, since it uses less digits than its factorization.

291868428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326 (or 1324 counting only the distinct ones).

The product of its digits is 442368, while the sum is 48.

The square root of 291868428 is about 17084.1572224093. The cubic root of 291868428 is about 663.3290841429.

The spelling of 291868428 in words is "two hundred ninety-one million, eight hundred sixty-eight thousand, four hundred twenty-eight".