72360581 has 2 divisors, whose sum is σ = 72360582. Its totient is φ = 72360580.

The previous prime is 72360557. The next prime is 72360611. The reversal of 72360581 is 18506327.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67387681 + 4972900 = 8209^2 + 2230^2 .

It is a cyclic number.

It is not a de Polignac number, because 72360581 - 2¹⁰ = 72359557 is a prime.

It is a super-2 number, since 2×72360581² = 10472107365315122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72360511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36180290 + 36180291.

It is an arithmetic number, because the mean of its divisors is an integer number (36180291).

Almost surely, 2^72360581 is an apocalyptic number.

It is an amenable number.

72360581 is a deficient number, since it is larger than the sum of its proper divisors (1).

72360581 is an equidigital number, since it uses as much as digits as its factorization.

72360581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 72360581 is about 8506.5022776697. The cubic root of 72360581 is about 416.7100887725.

The spelling of 72360581 in words is "seventy-two million, three hundred sixty thousand, five hundred eighty-one".