65645628 has 24 divisors (see below), whose sum is σ = 153665232. Its totient is φ = 21811584.

The previous prime is 65645621. The next prime is 65645651. The reversal of 65645628 is 82654656.

It is a self number, because there is not a number n which added to its sum of digits gives 65645628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65645621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4825 + ... + 12432.

It is an arithmetic number, because the mean of its divisors is an integer number (6402718).

Almost surely, 2^65645628 is an apocalyptic number.

It is an amenable number.

65645628 is an abundant number, since it is smaller than the sum of its proper divisors (88019604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65645628 is a wasteful number, since it uses less digits than its factorization.

65645628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17581 (or 17579 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The square root of 65645628 is about 8102.1989607760. The cubic root of 65645628 is about 403.3994196897.

Subtracting 65645628 from its reverse (82654656), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 65645628 in words is "sixty-five million, six hundred forty-five thousand, six hundred twenty-eight".