73218420 has 72 divisors (see below), whose sum is σ = 242292960. Its totient is φ = 17749440.

The previous prime is 73218391. The next prime is 73218427. The reversal of 73218420 is 2481237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73218427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16510 + ... + 20469.

It is an arithmetic number, because the mean of its divisors is an integer number (3365180).

Almost surely, 2^73218420 is an apocalyptic number.

It is an amenable number.

73218420 is an abundant number, since it is smaller than the sum of its proper divisors (169074540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73218420 is a wasteful number, since it uses less digits than its factorization.

73218420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37005 (or 37000 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 73218420 is about 8556.7762621212. The cubic root of 73218420 is about 418.3503316673.

Adding to 73218420 its reverse (2481237), we get a palindrome (75699657).

The spelling of 73218420 in words is "seventy-three million, two hundred eighteen thousand, four hundred twenty".