65272509 has 6 divisors (see below), whose sum is σ = 94282526. Its totient is φ = 43515000.

The previous prime is 65272481. The next prime is 65272513. The reversal of 65272509 is 90527256.

It can be written as a sum of positive squares in only one way, i.e., 46376100 + 18896409 = 6810^2 + 4347^2 .

It is not a de Polignac number, because 65272509 - 2⁸ = 65272253 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65272549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3626242 + ... + 3626259.

Almost surely, 2^65272509 is an apocalyptic number.

It is an amenable number.

65272509 is a deficient number, since it is larger than the sum of its proper divisors (29010017).

65272509 is a wasteful number, since it uses less digits than its factorization.

65272509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7252507 (or 7252504 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 65272509 is about 8079.1403626871. The cubic root of 65272509 is about 402.6336816607.

The spelling of 65272509 in words is "sixty-five million, two hundred seventy-two thousand, five hundred nine".