3638550440 has 32 divisors (see below), whose sum is σ = 9356273280. Its totient is φ = 1247502912.

The previous prime is 3638550379. The next prime is 3638550451. The reversal of 3638550440 is 440558363.

It is a junction number, because it is equal to n+sod(n) for n = 3638550394 and 3638550403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6497132 + ... + 6497691.

It is an arithmetic number, because the mean of its divisors is an integer number (292383540).

Almost surely, 2^3638550440 is an apocalyptic number.

It is an amenable number.

3638550440 is an abundant number, since it is smaller than the sum of its proper divisors (5717722840).

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

3638550440 is a wasteful number, since it uses less digits than its factorization.

3638550440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12994841 (or 12994837 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The square root of 3638550440 is about 60320.3982082347. The cubic root of 3638550440 is about 1538.0701130271.

The spelling of 3638550440 in words is "three billion, six hundred thirty-eight million, five hundred fifty thousand, four hundred forty".