65628486638 has 32 divisors (see below), whose sum is σ = 122456124000. Its totient is φ = 25916636160.

The previous prime is 65628486631. The next prime is 65628486643. The reversal of 65628486638 is 83668482656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65628486631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6744263 + ... + 6753986.

It is an arithmetic number, because the mean of its divisors is an integer number (3826753875).

Almost surely, 2^65628486638 is an apocalyptic number.

65628486638 is a deficient number, since it is larger than the sum of its proper divisors (56827637362).

65628486638 is a wasteful number, since it uses less digits than its factorization.

65628486638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13498292.

The product of its digits is 79626240, while the sum is 62.

The spelling of 65628486638 in words is "sixty-five billion, six hundred twenty-eight million, four hundred eighty-six thousand, six hundred thirty-eight".