65072109 has 4 divisors (see below), whose sum is σ = 86762816. Its totient is φ = 43381404.

The previous prime is 65072101. The next prime is 65072113. The reversal of 65072109 is 90127056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65072109 - 2³ = 65072101 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65072101) 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 3 ways as a sum of consecutive naturals, for example, 10845349 + ... + 10845354.

It is an arithmetic number, because the mean of its divisors is an integer number (21690704).

Almost surely, 2^65072109 is an apocalyptic number.

It is an amenable number.

65072109 is a deficient number, since it is larger than the sum of its proper divisors (21690707).

65072109 is a wasteful number, since it uses less digits than its factorization.

65072109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21690706.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 65072109 is about 8066.7285190466. The cubic root of 65072109 is about 402.2212032263.

The spelling of 65072109 in words is "sixty-five million, seventy-two thousand, one hundred nine".