491738323608 has 384 divisors, whose sum is σ = 1653261926400. Its totient is φ = 134882496000.

The previous prime is 491738323537. The next prime is 491738323633. The reversal of 491738323608 is 806323837194.

491738323608 is a `hidden beast` number, since 4 + 9 + 1 + 7 + 3 + 8 + 3 + 23 + 608 = 666.

It is a super-2 number, since 2×491738323608² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 41663308 + ... + 41675108.

It is an arithmetic number, because the mean of its divisors is an integer number (4305369600).

Almost surely, 2^491738323608 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 491738323608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (826630963200).

491738323608 is an abundant number, since it is smaller than the sum of its proper divisors (1161523602792).

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

491738323608 is a wasteful number, since it uses less digits than its factorization.

491738323608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11988 (or 11971 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 491738323608 in words is "four hundred ninety-one billion, seven hundred thirty-eight million, three hundred twenty-three thousand, six hundred eight".