491827489920 has 896 divisors, whose sum is σ = 1916042990400. Its totient is φ = 119946977280.

The previous prime is 491827489873. The next prime is 491827489921. The reversal of 491827489920 is 29984728194.

491827489920 is a `hidden beast` number, since 49 + 1 + 8 + 27 + 489 + 92 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (491827489921) 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 111 ways as a sum of consecutive naturals, for example, 794551371 + ... + 794551989.

Almost surely, 2^491827489920 is an apocalyptic number.

491827489920 is a gapful number since it is divisible by the number (40) 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 491827489920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958021495200).

491827489920 is an abundant number, since it is smaller than the sum of its proper divisors (1424215500480).

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

491827489920 is a wasteful number, since it uses less digits than its factorization.

491827489920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800 (or 773 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 63.

The spelling of 491827489920 in words is "four hundred ninety-one billion, eight hundred twenty-seven million, four hundred eighty-nine thousand, nine hundred twenty".