73218287 has 2 divisors, whose sum is σ = 73218288. Its totient is φ = 73218286.

The previous prime is 73218263. The next prime is 73218289. The reversal of 73218287 is 78281237.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 73218287 - 2²⁰ = 72169711 is a prime.

Together with 73218289, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73218287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73218289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36609143 + 36609144.

It is an arithmetic number, because the mean of its divisors is an integer number (36609144).

Almost surely, 2^73218287 is an apocalyptic number.

73218287 is a deficient number, since it is larger than the sum of its proper divisors (1).

73218287 is an equidigital number, since it uses as much as digits as its factorization.

73218287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 38.

The square root of 73218287 is about 8556.7684904992. The cubic root of 73218287 is about 418.3500783584.

The spelling of 73218287 in words is "seventy-three million, two hundred eighteen thousand, two hundred eighty-seven".