65138636 has 12 divisors (see below), whose sum is σ = 116643912. Its totient is φ = 31811808.

The previous prime is 65138629. The next prime is 65138651. The reversal of 65138636 is 63683156.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 65138636.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189185 + ... + 189528.

It is an arithmetic number, because the mean of its divisors is an integer number (9720326).

Almost surely, 2^65138636 is an apocalyptic number.

It is an amenable number.

65138636 is a deficient number, since it is larger than the sum of its proper divisors (51505276).

65138636 is a wasteful number, since it uses less digits than its factorization.

65138636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378760 (or 378758 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 65138636 is about 8070.8510084129. The cubic root of 65138636 is about 402.3582279139.

The spelling of 65138636 in words is "sixty-five million, one hundred thirty-eight thousand, six hundred thirty-six".