491500387448 has 256 divisors, whose sum is σ = 1158312960000. Its totient is φ = 195050419200.

The previous prime is 491500387439. The next prime is 491500387481. The reversal of 491500387448 is 844783005194.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 491500387448.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 184842743 + ... + 184845401.

It is an arithmetic number, because the mean of its divisors is an integer number (4524660000).

Almost surely, 2^491500387448 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 491500387448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (579156480000).

491500387448 is an abundant number, since it is smaller than the sum of its proper divisors (666812572552).

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

491500387448 is a wasteful number, since it uses less digits than its factorization.

491500387448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2811 (or 2793 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 491500387448 in words is "four hundred ninety-one billion, five hundred million, three hundred eighty-seven thousand, four hundred forty-eight".