73061440 has 56 divisors (see below), whose sum is σ = 179999640. Its totient is φ = 28213248.

The previous prime is 73061407. The next prime is 73061447. The reversal of 73061440 is 4416037.

It can be written as a sum of positive squares in 4 ways, for example, as 61504 + 72999936 = 248^2 + 8544^2 .

It is not an unprimeable number, because it can be changed into a prime (73061447) 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, 5344 + ... + 13216.

Almost surely, 2^73061440 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 73061440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89999820).

73061440 is an abundant number, since it is smaller than the sum of its proper divisors (106938200).

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

73061440 is a wasteful number, since it uses less digits than its factorization.

73061440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7919 (or 7909 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 73061440 is about 8547.5984931441. The cubic root of 73061440 is about 418.0511372615.

Adding to 73061440 its reverse (4416037), we get a palindrome (77477477).

The spelling of 73061440 in words is "seventy-three million, sixty-one thousand, four hundred forty".