1638652108 has 12 divisors (see below), whose sum is σ = 2867966640. Its totient is φ = 819233072.

The previous prime is 1638652073. The next prime is 1638652111. The reversal of 1638652108 is 8012568361.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29913 + ... + 64591.

It is an arithmetic number, because the mean of its divisors is an integer number (238997220).

Almost surely, 2^1638652108 is an apocalyptic number.

It is an amenable number.

1638652108 is a deficient number, since it is larger than the sum of its proper divisors (1229314532).

1638652108 is a wasteful number, since it uses less digits than its factorization.

1638652108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46496 (or 46494 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 1638652108 is about 40480.2681315230. The cubic root of 1638652108 is about 1178.9505435089.

The spelling of 1638652108 in words is "one billion, six hundred thirty-eight million, six hundred fifty-two thousand, one hundred eight".