65628638 has 16 divisors (see below), whose sum is σ = 100989504. Its totient is φ = 31971840.

The previous prime is 65628631. The next prime is 65628649. The reversal of 65628638 is 83682656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65628631) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 21206 + ... + 24102.

It is an arithmetic number, because the mean of its divisors is an integer number (6311844).

Almost surely, 2^65628638 is an apocalyptic number.

65628638 is a deficient number, since it is larger than the sum of its proper divisors (35360866).

65628638 is a wasteful number, since it uses less digits than its factorization.

65628638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3187.

The product of its digits is 414720, while the sum is 44.

The square root of 65628638 is about 8101.1504121328. The cubic root of 65628638 is about 403.3646148966.

It can be divided in two parts, 65628 and 638, that added together give a palindrome (66266).

The spelling of 65628638 in words is "sixty-five million, six hundred twenty-eight thousand, six hundred thirty-eight".