491472359840 has 864 divisors, whose sum is σ = 1547158620672. Its totient is φ = 146893824000.

The previous prime is 491472359813. The next prime is 491472359891. The reversal of 491472359840 is 48953274194.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3254783765 + ... + 3254783915.

It is an arithmetic number, because the mean of its divisors is an integer number (1790692848).

Almost surely, 2^491472359840 is an apocalyptic number.

491472359840 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 491472359840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773579310336).

491472359840 is an abundant number, since it is smaller than the sum of its proper divisors (1055686260832).

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

491472359840 is a wasteful number, since it uses less digits than its factorization.

491472359840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 491472359840 in words is "four hundred ninety-one billion, four hundred seventy-two million, three hundred fifty-nine thousand, eight hundred forty".