636491196 has 120 divisors (see below), whose sum is σ = 1824641280. Its totient is φ = 191872800.

The previous prime is 636491189. The next prime is 636491269. The reversal of 636491196 is 691194636.

636491196 is a `hidden beast` number, since 636 + 4 + 9 + 1 + 1 + 9 + 6 = 666.

636491196 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 965515 + ... + 966173.

It is an arithmetic number, because the mean of its divisors is an integer number (15205344).

Almost surely, 2^636491196 is an apocalyptic number.

636491196 is a gapful number since it is divisible by the number (66) 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 636491196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (912320640).

636491196 is an abundant number, since it is smaller than the sum of its proper divisors (1188150084).

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

636491196 is a wasteful number, since it uses less digits than its factorization.

636491196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957 (or 946 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 636491196 is about 25228.7771404006. Note that the first 3 decimals coincide. The cubic root of 636491196 is about 860.1960955393.

The spelling of 636491196 in words is "six hundred thirty-six million, four hundred ninety-one thousand, one hundred ninety-six".