73313440 has 48 divisors (see below), whose sum is σ = 174182400. Its totient is φ = 29159680.

The previous prime is 73313437. The next prime is 73313441. The reversal of 73313440 is 4431337.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (73313441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29361 + ... + 31759.

It is an arithmetic number, because the mean of its divisors is an integer number (3628800).

Almost surely, 2^73313440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73313440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87091200).

73313440 is an abundant number, since it is smaller than the sum of its proper divisors (100868960).

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

73313440 is a wasteful number, since it uses less digits than its factorization.

73313440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2605 (or 2597 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 25.

The square root of 73313440 is about 8562.3267865692. The cubic root of 73313440 is about 418.5312263332.

Adding to 73313440 its reverse (4431337), we get a palindrome (77744777).

The spelling of 73313440 in words is "seventy-three million, three hundred thirteen thousand, four hundred forty".