72261361 has 4 divisors (see below), whose sum is σ = 72278500. Its totient is φ = 72244224.

The previous prime is 72261347. The next prime is 72261367. The reversal of 72261361 is 16316227.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 20421361 + 51840000 = 4519^2 + 7200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72261361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72261367) 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, 2665 + ... + 12313.

It is an arithmetic number, because the mean of its divisors is an integer number (18069625).

Almost surely, 2^72261361 is an apocalyptic number.

It is an amenable number.

72261361 is a deficient number, since it is larger than the sum of its proper divisors (17139).

72261361 is an equidigital number, since it uses as much as digits as its factorization.

72261361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17138.

The product of its digits is 3024, while the sum is 28.

The square root of 72261361 is about 8500.6682678481. The cubic root of 72261361 is about 416.5195389521.

Adding to 72261361 its reverse (16316227), we get a palindrome (88577588).

The spelling of 72261361 in words is "seventy-two million, two hundred sixty-one thousand, three hundred sixty-one".