73218273 has 4 divisors (see below), whose sum is σ = 97624368. Its totient is φ = 48812180.

The previous prime is 73218263. The next prime is 73218287. The reversal of 73218273 is 37281237.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73218273 - 2⁵ = 73218241 is a prime.

It is a super-2 number, since 2×73218273² = 10721831002205058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (73218263) 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 in 3 ways as a sum of consecutive naturals, for example, 12203043 + ... + 12203048.

It is an arithmetic number, because the mean of its divisors is an integer number (24406092).

Almost surely, 2^73218273 is an apocalyptic number.

It is an amenable number.

73218273 is a deficient number, since it is larger than the sum of its proper divisors (24406095).

73218273 is a wasteful number, since it uses less digits than its factorization.

73218273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24406094.

The product of its digits is 14112, while the sum is 33.

The square root of 73218273 is about 8556.7676724333. The cubic root of 73218273 is about 418.3500516943.

The spelling of 73218273 in words is "seventy-three million, two hundred eighteen thousand, two hundred seventy-three".