491174428800 has 576 divisors, whose sum is σ = 1784460787200. Its totient is φ = 118657228800.

The previous prime is 491174428777. The next prime is 491174428841. The reversal of 491174428800 is 8824471194.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 491174428800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 451861857 + ... + 451862943.

It is an arithmetic number, because the mean of its divisors is an integer number (3098022200).

Almost surely, 2^491174428800 is an apocalyptic number.

491174428800 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 491174428800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (892230393600).

491174428800 is an abundant number, since it is smaller than the sum of its proper divisors (1293286358400).

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

491174428800 is a wasteful number, since it uses less digits than its factorization.

491174428800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525 (or 1497 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 48.

Adding to 491174428800 its reverse (8824471194), we get a palindrome (499998899994).

The spelling of 491174428800 in words is "four hundred ninety-one billion, one hundred seventy-four million, four hundred twenty-eight thousand, eight hundred".