65239645 has 4 divisors (see below), whose sum is σ = 78287580. Its totient is φ = 52191712.

The previous prime is 65239639. The next prime is 65239667. The reversal of 65239645 is 54693256.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46758244 + 18481401 = 6838^2 + 4299^2 .

It is a cyclic number.

It is not a de Polignac number, because 65239645 - 2⁵ = 65239613 is a prime.

It is a super-2 number, since 2×65239645² = 8512422559452050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 65239598 and 65239607.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6523960 + ... + 6523969.

It is an arithmetic number, because the mean of its divisors is an integer number (19571895).

Almost surely, 2^65239645 is an apocalyptic number.

It is an amenable number.

65239645 is a deficient number, since it is larger than the sum of its proper divisors (13047935).

65239645 is a wasteful number, since it uses less digits than its factorization.

65239645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13047934.

The product of its digits is 194400, while the sum is 40.

The square root of 65239645 is about 8077.1062268612. The cubic root of 65239645 is about 402.5660964201.

The spelling of 65239645 in words is "sixty-five million, two hundred thirty-nine thousand, six hundred forty-five".