65409709 has 8 divisors (see below), whose sum is σ = 66389760. Its totient is φ = 64433616.

The previous prime is 65409697. The next prime is 65409731. The reversal of 65409709 is 90790456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65409709 - 2⁷ = 65409581 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 (65409739) 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, 52872 + ... + 54094.

It is an arithmetic number, because the mean of its divisors is an integer number (8298720).

Almost surely, 2^65409709 is an apocalyptic number.

It is an amenable number.

65409709 is a deficient number, since it is larger than the sum of its proper divisors (980051).

65409709 is a wasteful number, since it uses less digits than its factorization.

65409709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 65409709 is about 8087.6269078142. The cubic root of 65409709 is about 402.9155904466.

The spelling of 65409709 in words is "sixty-five million, four hundred nine thousand, seven hundred nine".