491545728 has 96 divisors (see below), whose sum is σ = 1447514640. Its totient is φ = 160022016.

The previous prime is 491545727. The next prime is 491545739. The reversal of 491545728 is 827545194.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (491545727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44575 + ... + 54497.

Almost surely, 2^491545728 is an apocalyptic number.

491545728 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491545728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (723757320).

491545728 is an abundant number, since it is smaller than the sum of its proper divisors (955968912).

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

491545728 is a wasteful number, since it uses less digits than its factorization.

491545728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9986 (or 9971 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 491545728 is about 22170.8305663094. The cubic root of 491545728 is about 789.2016332296.

The spelling of 491545728 in words is "four hundred ninety-one million, five hundred forty-five thousand, seven hundred twenty-eight".