491318784 has 240 divisors, whose sum is σ = 1608647040. Its totient is φ = 148469760.

The previous prime is 491318767. The next prime is 491318791. The reversal of 491318784 is 487813194.

It is a happy number.

491318784 is a `hidden beast` number, since 491 + 3 + 1 + 87 + 84 = 666.

It is a super-2 number, since 2×491318784² = 482788295022477312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1368397 + ... + 1368755.

It is an arithmetic number, because the mean of its divisors is an integer number (6702696).

Almost surely, 2^491318784 is an apocalyptic number.

491318784 is a gapful number since it is divisible by the number (44) 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 491318784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804323520).

491318784 is an abundant number, since it is smaller than the sum of its proper divisors (1117328256).

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

491318784 is an equidigital number, since it uses as much as digits as its factorization.

491318784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 375 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 491318784 is about 22165.7118992375. The cubic root of 491318784 is about 789.0801578265.

The spelling of 491318784 in words is "four hundred ninety-one million, three hundred eighteen thousand, seven hundred eighty-four".