65894809 has 12 divisors (see below), whose sum is σ = 68636160. Its totient is φ = 63258600.

The previous prime is 65894797. The next prime is 65894813. The reversal of 65894809 is 90849856.

It is a happy number.

It is not a de Polignac number, because 65894809 - 2¹⁹ = 65370521 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65894819) 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 11 ways as a sum of consecutive naturals, for example, 183372 + ... + 183730.

It is an arithmetic number, because the mean of its divisors is an integer number (5719680).

Almost surely, 2^65894809 is an apocalyptic number.

It is an amenable number.

65894809 is a deficient number, since it is larger than the sum of its proper divisors (2741351).

65894809 is a wasteful number, since it uses less digits than its factorization.

65894809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 65894809 is about 8117.5617644709. The cubic root of 65894809 is about 403.9091898793.

It can be divided in two parts, 6589480 and 9, that added together give a square (6589489 = 2567²).

The spelling of 65894809 in words is "sixty-five million, eight hundred ninety-four thousand, eight hundred nine".