491423872680 has 192 divisors, whose sum is σ = 1736684127360. Its totient is φ = 119791332864.

The previous prime is 491423872663. The next prime is 491423872691. The reversal of 491423872680 is 86278324194.

491423872680 is a `hidden beast` number, since 4 + 91 + 423 + 8 + 72 + 68 + 0 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27694 + ... + 991773.

It is an arithmetic number, because the mean of its divisors is an integer number (9045229830).

Almost surely, 2^491423872680 is an apocalyptic number.

491423872680 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 491423872680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (868342063680).

491423872680 is an abundant number, since it is smaller than the sum of its proper divisors (1245260254680).

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

491423872680 is a wasteful number, since it uses less digits than its factorization.

491423872680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019600 (or 1019593 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 491423872680 in words is "four hundred ninety-one billion, four hundred twenty-three million, eight hundred seventy-two thousand, six hundred eighty".