65381638 has 16 divisors (see below), whose sum is σ = 112191264. Its totient is φ = 27993600.

The previous prime is 65381623. The next prime is 65381651. The reversal of 65381638 is 83618356.

65381638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 65381638.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20956 + ... + 23872.

It is an arithmetic number, because the mean of its divisors is an integer number (7011954).

Almost surely, 2^65381638 is an apocalyptic number.

65381638 is a deficient number, since it is larger than the sum of its proper divisors (46809626).

65381638 is a wasteful number, since it uses less digits than its factorization.

65381638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4527.

The product of its digits is 103680, while the sum is 40.

The square root of 65381638 is about 8085.8912928631. The cubic root of 65381638 is about 402.8579442548.

The spelling of 65381638 in words is "sixty-five million, three hundred eighty-one thousand, six hundred thirty-eight".