72160811 has 4 divisors (see below), whose sum is σ = 72620592. Its totient is φ = 71701032.

The previous prime is 72160789. The next prime is 72160813. The reversal of 72160811 is 11806127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11806127 = 113 ⋅104479.

It is a cyclic number.

It is not a de Polignac number, because 72160811 - 2⁶ = 72160747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72160813) 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, 229655 + ... + 229968.

It is an arithmetic number, because the mean of its divisors is an integer number (18155148).

Almost surely, 2^72160811 is an apocalyptic number.

72160811 is a deficient number, since it is larger than the sum of its proper divisors (459781).

72160811 is a wasteful number, since it uses less digits than its factorization.

72160811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459780.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 72160811 is about 8494.7519681271. The cubic root of 72160811 is about 416.3262568643.

Adding to 72160811 its reverse (11806127), we get a palindrome (83966938).

The spelling of 72160811 in words is "seventy-two million, one hundred sixty thousand, eight hundred eleven".