72811 has 4 divisors (see below), whose sum is σ = 77112. Its totient is φ = 68512.

The previous prime is 72797. The next prime is 72817. The reversal of 72811 is 11827.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72817) 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, 2125 + ... + 2158.

It is an arithmetic number, because the mean of its divisors is an integer number (19278).

2⁷²⁸¹¹ is an apocalyptic number.

72811 is a deficient number, since it is larger than the sum of its proper divisors (4301).

72811 is a wasteful number, since it uses less digits than its factorization.

72811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4300.

The product of its digits is 112, while the sum is 19.

The square root of 72811 is about 269.8351348509. The cubic root of 72811 is about 41.7572925218.

It can be divided in two parts, 728 and 11, that multiplied together give a palindrome (8008).

The spelling of 72811 in words is "seventy-two thousand, eight hundred eleven".