72018377 has 2 divisors, whose sum is σ = 72018378. Its totient is φ = 72018376.

The previous prime is 72018319. The next prime is 72018413. The reversal of 72018377 is 77381027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69572281 + 2446096 = 8341^2 + 1564^2 .

It is an emirp because it is prime and its reverse (77381027) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72018377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72011377) 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, 36009188 + 36009189.

It is an arithmetic number, because the mean of its divisors is an integer number (36009189).

Almost surely, 2^72018377 is an apocalyptic number.

It is an amenable number.

72018377 is a deficient number, since it is larger than the sum of its proper divisors (1).

72018377 is an equidigital number, since it uses as much as digits as its factorization.

72018377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 72018377 is about 8486.3641802600. The cubic root of 72018377 is about 416.0521557666.

The spelling of 72018377 in words is "seventy-two million, eighteen thousand, three hundred seventy-seven".