73218871 has 4 divisors (see below), whose sum is σ = 79875144. Its totient is φ = 66562600.

The previous prime is 73218863. The next prime is 73218877. The reversal of 73218871 is 17881237.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 73218871 - 2³ = 73218863 is a prime.

It is a super-2 number, since 2×73218871² = 10722006141029282, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 73218871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73218877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3328120 + ... + 3328141.

It is an arithmetic number, because the mean of its divisors is an integer number (19968786).

Almost surely, 2^73218871 is an apocalyptic number.

73218871 is a deficient number, since it is larger than the sum of its proper divisors (6656273).

73218871 is a wasteful number, since it uses less digits than its factorization.

73218871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656272.

The product of its digits is 18816, while the sum is 37.

The square root of 73218871 is about 8556.8026154633. The cubic root of 73218871 is about 418.3511906297.

The spelling of 73218871 in words is "seventy-three million, two hundred eighteen thousand, eight hundred seventy-one".