636084636420 has 192 divisors, whose sum is σ = 1898392204800. Its totient is φ = 158829834240.

The previous prime is 636084636377. The next prime is 636084636431. The reversal of 636084636420 is 24636480636.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 636084636420.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20006296 + ... + 20038064.

It is an arithmetic number, because the mean of its divisors is an integer number (9887459400).

Almost surely, 2^636084636420 is an apocalyptic number.

636084636420 is a gapful number since it is divisible by the number (60) 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 636084636420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (949196102400).

636084636420 is an abundant number, since it is smaller than the sum of its proper divisors (1262307568380).

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

636084636420 is a wasteful number, since it uses less digits than its factorization.

636084636420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32158 (or 32156 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 48.

The spelling of 636084636420 in words is "six hundred thirty-six billion, eighty-four million, six hundred thirty-six thousand, four hundred twenty".