491109780 has 192 divisors, whose sum is σ = 1654894080. Its totient is φ = 106444800.

The previous prime is 491109779. The next prime is 491109797. The reversal of 491109780 is 87901194.

It is a happy number.

It is a congruent 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, 742650 + ... + 743310.

It is an arithmetic number, because the mean of its divisors is an integer number (8619240).

Almost surely, 2^491109780 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 491109780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (827447040).

491109780 is an abundant number, since it is smaller than the sum of its proper divisors (1163784300).

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

491109780 is a wasteful number, since it uses less digits than its factorization.

491109780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 491109780 is about 22160.9968187354. The cubic root of 491109780 is about 788.9682520023.

The spelling of 491109780 in words is "four hundred ninety-one million, one hundred nine thousand, seven hundred eighty".