636038816 has 144 divisors (see below), whose sum is σ = 1563722496. Its totient is φ = 253016064.

The previous prime is 636038783. The next prime is 636038869. The reversal of 636038816 is 618830636.

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, 2852081 + ... + 2852303.

It is an arithmetic number, because the mean of its divisors is an integer number (10859184).

Almost surely, 2^636038816 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 636038816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (781861248).

636038816 is an abundant number, since it is smaller than the sum of its proper divisors (927683680).

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

636038816 is a wasteful number, since it uses less digits than its factorization.

636038816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 636038816 is about 25219.8099913540. The cubic root of 636038816 is about 859.9922552034.

The spelling of 636038816 in words is "six hundred thirty-six million, thirty-eight thousand, eight hundred sixteen".