636415040 has 28 divisors (see below), whose sum is σ = 1515464076. Its totient is φ = 254565888.

The previous prime is 636414959. The next prime is 636415049. The reversal of 636415040 is 40514636.

It is a happy number.

636415040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 180848704 + 455566336 = 13448^2 + 21344^2 .

It is a junction number, because it is equal to n+sod(n) for n = 636414994 and 636415012.

It is not an unprimeable number, because it can be changed into a prime (636415049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994079 + ... + 994718.

It is an arithmetic number, because the mean of its divisors is an integer number (54123717).

Almost surely, 2^636415040 is an apocalyptic number.

It is an amenable number.

636415040 is an abundant number, since it is smaller than the sum of its proper divisors (879049036).

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

636415040 is a wasteful number, since it uses less digits than its factorization.

636415040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988814 (or 1988804 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 636415040 is about 25227.2677870593. The cubic root of 636415040 is about 860.1617867606.

Adding to 636415040 its reverse (40514636), we get a palindrome (676929676).

The spelling of 636415040 in words is "six hundred thirty-six million, four hundred fifteen thousand, forty".