73218874 has 4 divisors (see below), whose sum is σ = 109828314. Its totient is φ = 36609436.

The previous prime is 73218863. The next prime is 73218877. The reversal of 73218874 is 47881237.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47881237 = 97 ⋅493621.

It can be written as a sum of positive squares in only one way, i.e., 66536649 + 6682225 = 8157^2 + 2585^2 .

It is a super-2 number, since 2×73218874² = 10722007019655752, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 18304717 + ... + 18304720.

Almost surely, 2^73218874 is an apocalyptic number.

73218874 is a deficient number, since it is larger than the sum of its proper divisors (36609440).

73218874 is a wasteful number, since it uses less digits than its factorization.

73218874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36609439.

The product of its digits is 75264, while the sum is 40.

The square root of 73218874 is about 8556.8027907624. The cubic root of 73218874 is about 418.3511963434.

The spelling of 73218874 in words is "seventy-three million, two hundred eighteen thousand, eight hundred seventy-four".