72162111 has 8 divisors (see below), whose sum is σ = 109961344. Its totient is φ = 41235480.

The previous prime is 72162089. The next prime is 72162119. The reversal of 72162111 is 11126127.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72162111 - 2⁷ = 72161983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 3436291 = 72162111 / (7 + 2 + 1 + 6 + 2 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72162119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1718125 + ... + 1718166.

It is an arithmetic number, because the mean of its divisors is an integer number (13745168).

Almost surely, 2^72162111 is an apocalyptic number.

72162111 is a deficient number, since it is larger than the sum of its proper divisors (37799233).

72162111 is a wasteful number, since it uses less digits than its factorization.

72162111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436301.

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

The square root of 72162111 is about 8494.8284856141. The cubic root of 72162111 is about 416.3287569327.

Adding to 72162111 its reverse (11126127), we get a palindrome (83288238).

The spelling of 72162111 in words is "seventy-two million, one hundred sixty-two thousand, one hundred eleven".