72618641 has 2 divisors, whose sum is σ = 72618642. Its totient is φ = 72618640.

The previous prime is 72618607. The next prime is 72618661. The reversal of 72618641 is 14681627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67305616 + 5313025 = 8204^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 72618641 - 2¹⁰ = 72617617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72618661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36309320 + 36309321.

It is an arithmetic number, because the mean of its divisors is an integer number (36309321).

Almost surely, 2^72618641 is an apocalyptic number.

It is an amenable number.

72618641 is a deficient number, since it is larger than the sum of its proper divisors (1).

72618641 is an equidigital number, since it uses as much as digits as its factorization.

72618641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 72618641 is about 8521.6571745172. The cubic root of 72618641 is about 417.2048729999.

The spelling of 72618641 in words is "seventy-two million, six hundred eighteen thousand, six hundred forty-one".