72481111 has 4 divisors (see below), whose sum is σ = 72737512. Its totient is φ = 72224712.

The previous prime is 72481109. The next prime is 72481117. The reversal of 72481111 is 11118427.

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

It is a cyclic number.

It is not a de Polignac number, because 72481111 - 2¹ = 72481109 is a prime.

It is a super-2 number, since 2×72481111² = 10507022903588642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72481117) 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, 127776 + ... + 128341.

It is an arithmetic number, because the mean of its divisors is an integer number (18184378).

Almost surely, 2^72481111 is an apocalyptic number.

72481111 is a deficient number, since it is larger than the sum of its proper divisors (256401).

72481111 is a wasteful number, since it uses less digits than its factorization.

72481111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256400.

The product of its digits is 448, while the sum is 25.

The square root of 72481111 is about 8513.5839104340. The cubic root of 72481111 is about 416.9413298024.

Adding to 72481111 its reverse (11118427), we get a palindrome (83599538).

The spelling of 72481111 in words is "seventy-two million, four hundred eighty-one thousand, one hundred eleven".