73243440 has 200 divisors, whose sum is σ = 259269120. Its totient is φ = 19160064.

The previous prime is 73243397. The next prime is 73243447. The reversal of 73243440 is 4434237.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (73243447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 576657 + ... + 576783.

Almost surely, 2^73243440 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 73243440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129634560).

73243440 is an abundant number, since it is smaller than the sum of its proper divisors (186025680).

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

73243440 is a wasteful number, since it uses less digits than its factorization.

73243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 27.

The square root of 73243440 is about 8558.2381364391. The cubic root of 73243440 is about 418.3979787542.

Adding to 73243440 its reverse (4434237), we get a palindrome (77677677).

The spelling of 73243440 in words is "seventy-three million, two hundred forty-three thousand, four hundred forty".