491536578 has 32 divisors (see below), whose sum is σ = 1072108800. Its totient is φ = 149325696.

The previous prime is 491536571. The next prime is 491536579. The reversal of 491536578 is 875635194.

It is not an unprimeable number, because it can be changed into a prime (491536571) 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 15 ways as a sum of consecutive naturals, for example, 33723 + ... + 46046.

It is an arithmetic number, because the mean of its divisors is an integer number (33503400).

Almost surely, 2^491536578 is an apocalyptic number.

491536578 is an abundant number, since it is smaller than the sum of its proper divisors (580572222).

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

491536578 is a wasteful number, since it uses less digits than its factorization.

491536578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79866.

The product of its digits is 907200, while the sum is 48.

The square root of 491536578 is about 22170.6242131339. The cubic root of 491536578 is about 789.1967362693.

The spelling of 491536578 in words is "four hundred ninety-one million, five hundred thirty-six thousand, five hundred seventy-eight".