636049968 has 80 divisors (see below), whose sum is σ = 1746138240. Its totient is φ = 198816768.

The previous prime is 636049957. The next prime is 636049987. The reversal of 636049968 is 869940636.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 636049968.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249243 + ... + 251781.

It is an arithmetic number, because the mean of its divisors is an integer number (21826728).

Almost surely, 2^636049968 is an apocalyptic number.

636049968 is a gapful number since it is divisible by the number (68) 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 636049968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (873069120).

636049968 is an abundant number, since it is smaller than the sum of its proper divisors (1110088272).

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

636049968 is a wasteful number, since it uses less digits than its factorization.

636049968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2874 (or 2868 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 51.

The square root of 636049968 is about 25220.0310864202. The cubic root of 636049968 is about 859.9972814048.

The spelling of 636049968 in words is "six hundred thirty-six million, forty-nine thousand, nine hundred sixty-eight".