491576979744 has 144 divisors (see below), whose sum is σ = 1470638332800. Its totient is φ = 155527024128.

The previous prime is 491576979731. The next prime is 491576979779. The reversal of 491576979744 is 447979675194.

491576979744 is a `hidden beast` number, since 4 + 9 + 1 + 576 + 9 + 7 + 9 + 7 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6024 + ... + 991559.

It is an arithmetic number, because the mean of its divisors is an integer number (10212766200).

Almost surely, 2^491576979744 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 491576979744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (735319166400).

491576979744 is an abundant number, since it is smaller than the sum of its proper divisors (979061353056).

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

491576979744 is a wasteful number, since it uses less digits than its factorization.

491576979744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997687 (or 997676 counting only the distinct ones).

The product of its digits is 480090240, while the sum is 72.

The spelling of 491576979744 in words is "four hundred ninety-one billion, five hundred seventy-six million, nine hundred seventy-nine thousand, seven hundred forty-four".