491697936 has 120 divisors (see below), whose sum is σ = 1463712120. Its totient is φ = 153550848.

The previous prime is 491697923. The next prime is 491697967. The reversal of 491697936 is 639796194.

491697936 is a `hidden beast` number, since 491 + 69 + 7 + 93 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 45643536 + 446054400 = 6756^2 + 21120^2 .

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, 863860 + ... + 864428.

It is an arithmetic number, because the mean of its divisors is an integer number (12197601).

Almost surely, 2^491697936 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 491697936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731856060).

491697936 is an abundant number, since it is smaller than the sum of its proper divisors (972014184).

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

491697936 is a wasteful number, since it uses less digits than its factorization.

491697936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953 (or 944 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 491697936 is about 22174.2629189788. The cubic root of 491697936 is about 789.2830840481.

The spelling of 491697936 in words is "four hundred ninety-one million, six hundred ninety-seven thousand, nine hundred thirty-six".