636315240 has 128 divisors (see below), whose sum is σ = 2173132800. Its totient is φ = 147544320.

The previous prime is 636315223. The next prime is 636315289. The reversal of 636315240 is 42513636.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 636315198 and 636315207.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19881 + ... + 40839.

It is an arithmetic number, because the mean of its divisors is an integer number (16977600).

Almost surely, 2^636315240 is an apocalyptic number.

636315240 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 636315240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086566400).

636315240 is an abundant number, since it is smaller than the sum of its proper divisors (1536817560).

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

636315240 is a wasteful number, since it uses less digits than its factorization.

636315240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21007 (or 21003 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 636315240 is about 25225.2896911017. The cubic root of 636315240 is about 860.1168220606.

Adding to 636315240 its reverse (42513636), we get a palindrome (678828876).

The spelling of 636315240 in words is "six hundred thirty-six million, three hundred fifteen thousand, two hundred forty".