491107172784 has 320 divisors, whose sum is σ = 1464715776000. Its totient is φ = 140983234560.

The previous prime is 491107172737. The next prime is 491107172863. The reversal of 491107172784 is 487271701194.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30327762 + ... + 30343950.

It is an arithmetic number, because the mean of its divisors is an integer number (4577236800).

Almost surely, 2^491107172784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491107172784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732357888000).

491107172784 is an abundant number, since it is smaller than the sum of its proper divisors (973608603216).

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

491107172784 is a wasteful number, since it uses less digits than its factorization.

491107172784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16316 (or 16310 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 51.

The spelling of 491107172784 in words is "four hundred ninety-one billion, one hundred seven million, one hundred seventy-two thousand, seven hundred eighty-four".