491718330 has 128 divisors (see below), whose sum is σ = 1375799040. Its totient is φ = 124830720.

The previous prime is 491718323. The next prime is 491718341. The reversal of 491718330 is 33817194.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 475494 + ... + 476526.

It is an arithmetic number, because the mean of its divisors is an integer number (10748430).

Almost surely, 2^491718330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491718330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (687899520).

491718330 is an abundant number, since it is smaller than the sum of its proper divisors (884080710).

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

491718330 is a wasteful number, since it uses less digits than its factorization.

491718330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1127 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 491718330 is about 22174.7227716605. The cubic root of 491718330 is about 789.2939961789.

The spelling of 491718330 in words is "four hundred ninety-one million, seven hundred eighteen thousand, three hundred thirty".