491194728 has 48 divisors (see below), whose sum is σ = 1342114020. Its totient is φ = 162279936.

The previous prime is 491194727. The next prime is 491194733. The reversal of 491194728 is 827491194.

It is a happy number.

491194728 is a `hidden beast` number, since 491 + 1 + 94 + 72 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 459587844 + 31606884 = 21438^2 + 5622^2 .

It is not an unprimeable number, because it can be changed into a prime (491194727) 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 11 ways as a sum of consecutive naturals, for example, 22051 + ... + 38322.

Almost surely, 2^491194728 is an apocalyptic number.

It is an amenable number.

491194728 is an abundant number, since it is smaller than the sum of its proper divisors (850919292).

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

491194728 is a wasteful number, since it uses less digits than its factorization.

491194728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60498 (or 60491 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 491194728 is about 22162.9133463992. The cubic root of 491194728 is about 789.0137390563.

The spelling of 491194728 in words is "four hundred ninety-one million, one hundred ninety-four thousand, seven hundred twenty-eight".