491758816 has 12 divisors (see below), whose sum is σ = 968150232. Its totient is φ = 245879392.

The previous prime is 491758811. The next prime is 491758843. The reversal of 491758816 is 618857194.

It is a super-2 number, since 2×491758816² = 483653466227443712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 491758816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491758811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7683700 + ... + 7683763.

It is an arithmetic number, because the mean of its divisors is an integer number (80679186).

Almost surely, 2^491758816 is an apocalyptic number.

It is an amenable number.

491758816 is a deficient number, since it is larger than the sum of its proper divisors (476391416).

491758816 is a wasteful number, since it uses less digits than its factorization.

491758816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15367473 (or 15367465 counting only the distinct ones).

The product of its digits is 483840, while the sum is 49.

The square root of 491758816 is about 22175.6356391423. The cubic root of 491758816 is about 789.3156579568.

The spelling of 491758816 in words is "four hundred ninety-one million, seven hundred fifty-eight thousand, eight hundred sixteen".