72211611 has 4 divisors (see below), whose sum is σ = 96282152. Its totient is φ = 48141072.

The previous prime is 72211589. The next prime is 72211621. The reversal of 72211611 is 11611227.

It is a happy number.

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

It is not a de Polignac number, because 72211611 - 2⁶ = 72211547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72211621) 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, 12035266 + ... + 12035271.

It is an arithmetic number, because the mean of its divisors is an integer number (24070538).

Almost surely, 2^72211611 is an apocalyptic number.

72211611 is a deficient number, since it is larger than the sum of its proper divisors (24070541).

72211611 is a wasteful number, since it uses less digits than its factorization.

72211611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24070540.

The product of its digits is 168, while the sum is 21.

The square root of 72211611 is about 8497.7415234873. The cubic root of 72211611 is about 416.4239295141.

Adding to 72211611 its reverse (11611227), we get a palindrome (83822838).

The spelling of 72211611 in words is "seventy-two million, two hundred eleven thousand, six hundred eleven".