491374608 has 80 divisors (see below), whose sum is σ = 1329289920. Its totient is φ = 156201472.

The previous prime is 491374603. The next prime is 491374643. The reversal of 491374608 is 806473194.

It is a self number, because there is not a number n which added to its sum of digits gives 491374608.

It is not an unprimeable number, because it can be changed into a prime (491374601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113410 + ... + 117662.

It is an arithmetic number, because the mean of its divisors is an integer number (16616124).

Almost surely, 2^491374608 is an apocalyptic number.

491374608 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 491374608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (664644960).

491374608 is an abundant number, since it is smaller than the sum of its proper divisors (837915312).

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

491374608 is a wasteful number, since it uses less digits than its factorization.

491374608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4376 (or 4370 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 491374608 is about 22166.9711056788. The cubic root of 491374608 is about 789.1100419831.

The spelling of 491374608 in words is "four hundred ninety-one million, three hundred seventy-four thousand, six hundred eight".