491765064 has 64 divisors (see below), whose sum is σ = 1453507200. Its totient is φ = 135657984.

The previous prime is 491765041. The next prime is 491765077. The reversal of 491765064 is 460567194.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 45597 + ... + 55340.

It is an arithmetic number, because the mean of its divisors is an integer number (22711050).

Almost surely, 2^491765064 is an apocalyptic number.

It is an amenable number.

491765064 is an abundant number, since it is smaller than the sum of its proper divisors (961742136).

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

491765064 is a wasteful number, since it uses less digits than its factorization.

491765064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100982 (or 100978 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 491765064 is about 22175.7765140254. The cubic root of 491765064 is about 789.3190008037.

The spelling of 491765064 in words is "four hundred ninety-one million, seven hundred sixty-five thousand, sixty-four".