72115361 has 4 divisors (see below), whose sum is σ = 72226452. Its totient is φ = 72004272.

The previous prime is 72115333. The next prime is 72115397. The reversal of 72115361 is 16351127.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35331136 + 36784225 = 5944^2 + 6065^2 .

It is a cyclic number.

It is not a de Polignac number, because 72115361 - 2²⁶ = 5006497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72115361.

It is not an unprimeable number, because it can be changed into a prime (72115261) 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, 54566 + ... + 55871.

It is an arithmetic number, because the mean of its divisors is an integer number (18056613).

Almost surely, 2^72115361 is an apocalyptic number.

It is an amenable number.

72115361 is a deficient number, since it is larger than the sum of its proper divisors (111091).

72115361 is a wasteful number, since it uses less digits than its factorization.

72115361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111090.

The product of its digits is 1260, while the sum is 26.

The square root of 72115361 is about 8492.0763656482. The cubic root of 72115361 is about 416.2388317456.

Adding to 72115361 its reverse (16351127), we get a palindrome (88466488).

The spelling of 72115361 in words is "seventy-two million, one hundred fifteen thousand, three hundred sixty-one".