73223440 has 40 divisors (see below), whose sum is σ = 170614080. Its totient is φ = 29225856.

The previous prime is 73223431. The next prime is 73223483. The reversal of 73223440 is 4432237.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57531 + ... + 58789.

It is an arithmetic number, because the mean of its divisors is an integer number (4265352).

Almost surely, 2^73223440 is an apocalyptic number.

It is an amenable number.

73223440 is an abundant number, since it is smaller than the sum of its proper divisors (97390640).

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

73223440 is a wasteful number, since it uses less digits than its factorization.

73223440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999 (or 1993 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 25.

The square root of 73223440 is about 8557.0695918638. The cubic root of 73223440 is about 418.3598924248.

Adding to 73223440 its reverse (4432237), we get a palindrome (77655677).

The spelling of 73223440 in words is "seventy-three million, two hundred twenty-three thousand, four hundred forty".