491777568 has 96 divisors (see below), whose sum is σ = 1452265920. Its totient is φ = 163902528.

The previous prime is 491777491. The next prime is 491777579. The reversal of 491777568 is 865777194.

491777568 is a `hidden beast` number, since 4 + 9 + 1 + 7 + 77 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66471 + ... + 73497.

It is an arithmetic number, because the mean of its divisors is an integer number (15127770).

Almost surely, 2^491777568 is an apocalyptic number.

491777568 is a gapful number since it is divisible by the number (48) 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 491777568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726132960).

491777568 is an abundant number, since it is smaller than the sum of its proper divisors (960488352).

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

491777568 is an frugal number, since it uses more digits than its factorization.

491777568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7058 (or 7032 counting only the distinct ones).

The product of its digits is 2963520, while the sum is 54.

The square root of 491777568 is about 22176.0584414814. The cubic root of 491777568 is about 789.3256906928.

The spelling of 491777568 in words is "four hundred ninety-one million, seven hundred seventy-seven thousand, five hundred sixty-eight".