73218605 has 16 divisors (see below), whose sum is σ = 90660864. Its totient is φ = 56738880.

The previous prime is 73218601. The next prime is 73218611. The reversal of 73218605 is 50681237.

It is a happy number.

It is not a de Polignac number, because 73218605 - 2² = 73218601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73218601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18644 + ... + 22226.

It is an arithmetic number, because the mean of its divisors is an integer number (5666304).

Almost surely, 2^73218605 is an apocalyptic number.

It is an amenable number.

73218605 is a deficient number, since it is larger than the sum of its proper divisors (17442259).

73218605 is a wasteful number, since it uses less digits than its factorization.

73218605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3716.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 73218605 is about 8556.7870722602. The cubic root of 73218605 is about 418.3506840138.

The spelling of 73218605 in words is "seventy-three million, two hundred eighteen thousand, six hundred five".