636048820 has 48 divisors (see below), whose sum is σ = 1466152128. Its totient is φ = 229858560.

The previous prime is 636048817. The next prime is 636048821. The reversal of 636048820 is 28840636.

It is a self number, because there is not a number n which added to its sum of digits gives 636048820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636048821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26992 + ... + 44728.

It is an arithmetic number, because the mean of its divisors is an integer number (30544836).

Almost surely, 2^636048820 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 636048820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733076064).

636048820 is an abundant number, since it is smaller than the sum of its proper divisors (830103308).

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

636048820 is a wasteful number, since it uses less digits than its factorization.

636048820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17920 (or 17918 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 636048820 is about 25220.0083267234. The cubic root of 636048820 is about 859.9967640044.

The spelling of 636048820 in words is "six hundred thirty-six million, forty-eight thousand, eight hundred twenty".