491788528440 has 128 divisors (see below), whose sum is σ = 1694199801600. Its totient is φ = 112946641920.

The previous prime is 491788528409. The next prime is 491788528453. The reversal of 491788528440 is 44825887194.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 9779317 + ... + 9829476.

It is an arithmetic number, because the mean of its divisors is an integer number (13235935950).

Almost surely, 2^491788528440 is an apocalyptic number.

491788528440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491788528440 is an abundant number, since it is smaller than the sum of its proper divisors (1202411273160).

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

491788528440 is a wasteful number, since it uses less digits than its factorization.

491788528440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19608837 (or 19608833 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 60.

The spelling of 491788528440 in words is "four hundred ninety-one billion, seven hundred eighty-eight million, five hundred twenty-eight thousand, four hundred forty".