491890758 has 8 divisors (see below), whose sum is σ = 983781528. Its totient is φ = 163963584.

The previous prime is 491890709. The next prime is 491890759. The reversal of 491890758 is 857098194.

It is a sphenic number, since it is the product of 3 distinct primes.

491890758 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 491890758.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491890759) 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 3 ways as a sum of consecutive naturals, for example, 40990891 + ... + 40990902.

It is an arithmetic number, because the mean of its divisors is an integer number (122972691).

Almost surely, 2^491890758 is an apocalyptic number.

491890758 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

491890758 is a wasteful number, since it uses less digits than its factorization.

491890758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81981798.

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 491890758 is about 22178.6103712564. The cubic root of 491890758 is about 789.3862444384.

The spelling of 491890758 in words is "four hundred ninety-one million, eight hundred ninety thousand, seven hundred fifty-eight".