491917824 has 60 divisors (see below), whose sum is σ = 1419721446. Its totient is φ = 163971072.

The previous prime is 491917793. The next prime is 491917861. The reversal of 491917824 is 428719194.

It is a happy number.

491917824 is a `hidden beast` number, since 491 + 91 + 78 + 2 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 385415424 + 106502400 = 19632^2 + 10320^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 491917824.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48769 + ... + 57984.

Almost surely, 2^491917824 is an apocalyptic number.

It is an amenable number.

491917824 is an abundant number, since it is smaller than the sum of its proper divisors (927803622).

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

491917824 is a wasteful number, since it uses less digits than its factorization.

491917824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106777 (or 106758 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 491917824 is about 22179.2205453663. The cubic root of 491917824 is about 789.4007226776.

The spelling of 491917824 in words is "four hundred ninety-one million, nine hundred seventeen thousand, eight hundred twenty-four".