72255811 has 4 divisors (see below), whose sum is σ = 75397392. Its totient is φ = 69114232.

The previous prime is 72255769. The next prime is 72255847. The reversal of 72255811 is 11855227.

72255811 = T₆₉₃₉ + T₆₉₄₀ + T₆₉₄₁.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11855227 = 157 ⋅75511.

It is a cyclic number.

It is not a de Polignac number, because 72255811 - 2¹⁷ = 72124739 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72255871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1570756 + ... + 1570801.

It is an arithmetic number, because the mean of its divisors is an integer number (18849348).

Almost surely, 2^72255811 is an apocalyptic number.

72255811 is the 6941-st centered triangular number.

72255811 is a deficient number, since it is larger than the sum of its proper divisors (3141581).

72255811 is a wasteful number, since it uses less digits than its factorization.

72255811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141580.

The product of its digits is 5600, while the sum is 31.

The square root of 72255811 is about 8500.3418166566. The cubic root of 72255811 is about 416.5088751497.

The spelling of 72255811 in words is "seventy-two million, two hundred fifty-five thousand, eight hundred eleven".