635665540 has 24 divisors (see below), whose sum is σ = 1377960192. Its totient is φ = 246063840.

The previous prime is 635665523. The next prime is 635665637. The reversal of 635665540 is 45566536.

It is a happy number.

635665540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 635665493 and 635665502.

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, 512014 + ... + 513253.

It is an arithmetic number, because the mean of its divisors is an integer number (57415008).

Almost surely, 2^635665540 is an apocalyptic number.

It is an amenable number.

635665540 is an abundant number, since it is smaller than the sum of its proper divisors (742294652).

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

635665540 is a wasteful number, since it uses less digits than its factorization.

635665540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025307 (or 1025305 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 40.

The square root of 635665540 is about 25212.4084529820. The cubic root of 635665540 is about 859.8239859720.

The spelling of 635665540 in words is "six hundred thirty-five million, six hundred sixty-five thousand, five hundred forty".