72304061 has 2 divisors, whose sum is σ = 72304062. Its totient is φ = 72304060.

The previous prime is 72303991. The next prime is 72304069. The reversal of 72304061 is 16040327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72148036 + 156025 = 8494^2 + 395^2 .

It is an emirp because it is prime and its reverse (16040327) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72304061 is a prime.

It is a super-3 number, since 3×72304061³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72304069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36152030 + 36152031.

It is an arithmetic number, because the mean of its divisors is an integer number (36152031).

Almost surely, 2^72304061 is an apocalyptic number.

It is an amenable number.

72304061 is a deficient number, since it is larger than the sum of its proper divisors (1).

72304061 is an equidigital number, since it uses as much as digits as its factorization.

72304061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 72304061 is about 8503.1794641769. The cubic root of 72304061 is about 416.6015647265.

Adding to 72304061 its reverse (16040327), we get a palindrome (88344388).

The spelling of 72304061 in words is "seventy-two million, three hundred four thousand, sixty-one".