636379689834 has 256 divisors, whose sum is σ = 1806105600000. Its totient is φ = 161691780096.

The previous prime is 636379689811. The next prime is 636379689863. The reversal of 636379689834 is 438986973636.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 47487867 + ... + 47501265.

It is an arithmetic number, because the mean of its divisors is an integer number (7055100000).

Almost surely, 2^636379689834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636379689834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903052800000).

636379689834 is an abundant number, since it is smaller than the sum of its proper divisors (1169725910166).

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

636379689834 is a wasteful number, since it uses less digits than its factorization.

636379689834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13842 (or 13836 counting only the distinct ones).

The product of its digits is 846526464, while the sum is 72.

The spelling of 636379689834 in words is "six hundred thirty-six billion, three hundred seventy-nine million, six hundred eighty-nine thousand, eight hundred thirty-four".