72065911 has 4 divisors (see below), whose sum is σ = 72229032. Its totient is φ = 71902792.

The previous prime is 72065897. The next prime is 72065921. The reversal of 72065911 is 11956027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11956027 = 191 ⋅62597.

It is a cyclic number.

It is not a de Polignac number, because 72065911 - 2¹¹ = 72063863 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 (72065921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80896 + ... + 81781.

It is an arithmetic number, because the mean of its divisors is an integer number (18057258).

Almost surely, 2^72065911 is an apocalyptic number.

72065911 is a deficient number, since it is larger than the sum of its proper divisors (163121).

72065911 is a wasteful number, since it uses less digits than its factorization.

72065911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163120.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 72065911 is about 8489.1643287193. The cubic root of 72065911 is about 416.1436707130.

The spelling of 72065911 in words is "seventy-two million, sixty-five thousand, nine hundred eleven".