491647788 has 36 divisors (see below), whose sum is σ = 1285633440. Its totient is φ = 158231136.

The previous prime is 491647763. The next prime is 491647789. The reversal of 491647788 is 887746194.

It is a happy number.

491647788 is a `hidden beast` number, since 4 + 91 + 6 + 477 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (491647789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234420 + ... + 236507.

It is an arithmetic number, because the mean of its divisors is an integer number (35712040).

Almost surely, 2^491647788 is an apocalyptic number.

It is an amenable number.

491647788 is an abundant number, since it is smaller than the sum of its proper divisors (793985652).

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

491647788 is a wasteful number, since it uses less digits than its factorization.

491647788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470966 (or 470961 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 491647788 is about 22173.1321197525. The cubic root of 491647788 is about 789.2562502877.

The spelling of 491647788 in words is "four hundred ninety-one million, six hundred forty-seven thousand, seven hundred eighty-eight".