72280361 has 2 divisors, whose sum is σ = 72280362. Its totient is φ = 72280360.

The previous prime is 72280357. The next prime is 72280367. The reversal of 72280361 is 16308227.

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., 46717225 + 25563136 = 6835^2 + 5056^2 .

It is a cyclic number.

It is not a de Polignac number, because 72280361 - 2² = 72280357 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (72280367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36140180 + 36140181.

It is an arithmetic number, because the mean of its divisors is an integer number (36140181).

Almost surely, 2^72280361 is an apocalyptic number.

It is an amenable number.

72280361 is a deficient number, since it is larger than the sum of its proper divisors (1).

72280361 is an equidigital number, since it uses as much as digits as its factorization.

72280361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 72280361 is about 8501.7857535932. The cubic root of 72280361 is about 416.5560415294.

Adding to 72280361 its reverse (16308227), we get a palindrome (88588588).

The spelling of 72280361 in words is "seventy-two million, two hundred eighty thousand, three hundred sixty-one".